[kuba:tls-wip 25/27] net/tls/tls_sw.c:1952:6: warning: variable 'rxm' is uninitialized when used here

From: kernel test robot
Date: Sat Jun 04 2022 - 02:52:30 EST

tree: https://git.kernel.org/pub/scm/linux/kernel/git/kuba/linux.git tls-wip
head: 38f7b843197f36fd1147d14d8dac84f0d480946d
commit: 03804ec62cc6126f981623a3d4afb3fa4eba64c7 [25/27] rxm - move updates into ctx
config: arm64-buildonly-randconfig-r002-20220531 (https://download.01.org/0day-ci/archive/20220604/202206041430.w06wF78n-lkp@xxxxxxxxx/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project b364c76683f8ef241025a9556300778c07b590c2)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install arm64 cross compiling tool for clang build
# apt-get install binutils-aarch64-linux-gnu
# https://git.kernel.org/pub/scm/linux/kernel/git/kuba/linux.git/commit/?id=03804ec62cc6126f981623a3d4afb3fa4eba64c7
git remote add kuba https://git.kernel.org/pub/scm/linux/kernel/git/kuba/linux.git
git fetch --no-tags kuba tls-wip
git checkout 03804ec62cc6126f981623a3d4afb3fa4eba64c7
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash net/tls/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

>> net/tls/tls_sw.c:1952:6: warning: variable 'rxm' is uninitialized when used here [-Wuninitialized]
rxm->offset = rxm->offset + rxm->full_len;
^~~
net/tls/tls_sw.c:1944:24: note: initialize the variable 'rxm' to silence this warning
struct strp_msg *rxm;
^
= NULL
1 warning generated.


vim +/rxm +1952 net/tls/tls_sw.c

9655bea3d64350 Jakub Kicinski 2022-04-01 1815
c46234ebb4d1ee Dave Watson 2018-03-22 1816 int tls_sw_recvmsg(struct sock *sk,
c46234ebb4d1ee Dave Watson 2018-03-22 1817 struct msghdr *msg,
c46234ebb4d1ee Dave Watson 2018-03-22 1818 size_t len,
c46234ebb4d1ee Dave Watson 2018-03-22 1819 int flags,
c46234ebb4d1ee Dave Watson 2018-03-22 1820 int *addr_len)
c46234ebb4d1ee Dave Watson 2018-03-22 1821 {
c46234ebb4d1ee Dave Watson 2018-03-22 1822 struct tls_context *tls_ctx = tls_get_ctx(sk);
f66de3ee2c161f Boris Pismenny 2018-04-30 1823 struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
4509de14680084 Vakul Garg 2019-02-14 1824 struct tls_prot_info *prot = &tls_ctx->prot_info;
d3b18ad31f93d0 John Fastabend 2018-10-13 1825 struct sk_psock *psock;
692d7b5d1f9125 Vakul Garg 2019-01-16 1826 unsigned char control = 0;
692d7b5d1f9125 Vakul Garg 2019-01-16 1827 ssize_t decrypted = 0;
9655bea3d64350 Jakub Kicinski 2022-04-01 1828 size_t flushed_at = 0;
c46234ebb4d1ee Dave Watson 2018-03-22 1829 struct sk_buff *skb;
c46234ebb4d1ee Dave Watson 2018-03-22 1830 ssize_t copied = 0;
7da18bcc5e4cfd Jakub Kicinski 2022-04-08 1831 bool async = false;
06030dbaf3b6c5 Daniel Borkmann 2018-06-15 1832 int target, err = 0;
c46234ebb4d1ee Dave Watson 2018-03-22 1833 long timeo;
00e23707442a75 David Howells 2018-10-22 1834 bool is_kvec = iov_iter_is_kvec(&msg->msg_iter);
692d7b5d1f9125 Vakul Garg 2019-01-16 1835 bool is_peek = flags & MSG_PEEK;
e91de6afa81c10 John Fastabend 2020-05-29 1836 bool bpf_strp_enabled;
ba13609df18dab Jakub Kicinski 2022-04-08 1837 bool zc_capable;
c46234ebb4d1ee Dave Watson 2018-03-22 1838
c46234ebb4d1ee Dave Watson 2018-03-22 1839 if (unlikely(flags & MSG_ERRQUEUE))
c46234ebb4d1ee Dave Watson 2018-03-22 1840 return sock_recv_errqueue(sk, msg, len, SOL_IP, IP_RECVERR);
c46234ebb4d1ee Dave Watson 2018-03-22 1841
d3b18ad31f93d0 John Fastabend 2018-10-13 1842 psock = sk_psock_get(sk);
c46234ebb4d1ee Dave Watson 2018-03-22 1843 lock_sock(sk);
e91de6afa81c10 John Fastabend 2020-05-29 1844 bpf_strp_enabled = sk_psock_strp_enabled(psock);
c46234ebb4d1ee Dave Watson 2018-03-22 1845
f314bfee81b1bf Jakub Kicinski 2022-04-11 1846 /* If crypto failed the connection is broken */
f314bfee81b1bf Jakub Kicinski 2022-04-11 1847 err = ctx->async_wait.err;
f314bfee81b1bf Jakub Kicinski 2022-04-11 1848 if (err)
f314bfee81b1bf Jakub Kicinski 2022-04-11 1849 goto end;
f314bfee81b1bf Jakub Kicinski 2022-04-11 1850
692d7b5d1f9125 Vakul Garg 2019-01-16 1851 /* Process pending decrypted records. It must be non-zero-copy */
06554f4ffc2595 Jakub Kicinski 2022-04-08 1852 err = process_rx_list(ctx, msg, &control, 0, len, false, is_peek);
4dcdd971b9c7a5 Jakub Kicinski 2022-04-11 1853 if (err < 0)
692d7b5d1f9125 Vakul Garg 2019-01-16 1854 goto end;
692d7b5d1f9125 Vakul Garg 2019-01-16 1855
d5123edd10cf9d Jakub Kicinski 2022-04-07 1856 copied = err;
46a1695960d060 Jakub Kicinski 2019-05-24 1857 if (len <= copied)
bfc06e1aaa130b Jakub Kicinski 2022-04-07 1858 goto end;
46a1695960d060 Jakub Kicinski 2019-05-24 1859
06030dbaf3b6c5 Daniel Borkmann 2018-06-15 1860 target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
46a1695960d060 Jakub Kicinski 2019-05-24 1861 len = len - copied;
c46234ebb4d1ee Dave Watson 2018-03-22 1862 timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
692d7b5d1f9125 Vakul Garg 2019-01-16 1863
ba13609df18dab Jakub Kicinski 2022-04-08 1864 zc_capable = !bpf_strp_enabled && !is_kvec && !is_peek &&
b814ee782eef62 Jakub Kicinski 2021-12-15 1865 ctx->zc_capable;
bfc06e1aaa130b Jakub Kicinski 2022-04-07 1866 decrypted = 0;
04b25a5411f966 Jakub Kicinski 2019-05-24 1867 while (len && (decrypted + copied < target || ctx->recv_pkt)) {
a7026cf1297903 Jakub Kicinski 2022-05-26 1868 struct tls_decrypt_arg darg;
9bdf75ccffa690 Jakub Kicinski 2022-04-08 1869 int to_decrypt, chunk;
c46234ebb4d1ee Dave Watson 2018-03-22 1870
a7026cf1297903 Jakub Kicinski 2022-05-26 1871 memset(&darg.inargs, 0, sizeof(darg.inargs));
e3508236c701de Jakub Kicinski 2022-05-26 1872 err = tls_wait_data(sk, psock, flags & MSG_DONTWAIT, timeo);
e3508236c701de Jakub Kicinski 2022-05-26 1873 if (err <= 0) {
d3b18ad31f93d0 John Fastabend 2018-10-13 1874 if (psock) {
0775639ce1ca95 Jakub Kicinski 2022-04-11 1875 chunk = sk_msg_recvmsg(sk, psock, msg, len,
2bc793e3272a13 Cong Wang 2021-03-30 1876 flags);
257fd01208cd4c Jakub Kicinski 2022-05-25 1877 if (chunk > 0) {
257fd01208cd4c Jakub Kicinski 2022-05-25 1878 decrypted += chunk;
257fd01208cd4c Jakub Kicinski 2022-05-25 1879 len -= chunk;
257fd01208cd4c Jakub Kicinski 2022-05-25 1880 continue;
257fd01208cd4c Jakub Kicinski 2022-05-25 1881 }
d3b18ad31f93d0 John Fastabend 2018-10-13 1882 }
c46234ebb4d1ee Dave Watson 2018-03-22 1883 goto recv_end;
d3b18ad31f93d0 John Fastabend 2018-10-13 1884 }
c46234ebb4d1ee Dave Watson 2018-03-22 1885
03804ec62cc612 Jakub Kicinski 2022-06-02 1886 to_decrypt = ctx->full_len - prot->overhead_size;
fedf201e12960b Dave Watson 2019-01-30 1887
06fa4c1bf464a9 Jakub Kicinski 2022-05-26 1888 /* periodically flush backlog, and feed strparser */
06fa4c1bf464a9 Jakub Kicinski 2022-05-26 1889 tls_read_flush_backlog(sk, prot, len, to_decrypt,
06fa4c1bf464a9 Jakub Kicinski 2022-05-26 1890 decrypted + copied, &flushed_at);
06fa4c1bf464a9 Jakub Kicinski 2022-05-26 1891
ba13609df18dab Jakub Kicinski 2022-04-08 1892 if (zc_capable && to_decrypt <= len &&
efb7d5ac289e35 Jakub Kicinski 2022-06-01 1893 ctx->control == TLS_RECORD_TYPE_DATA)
4175eac37123a6 Jakub Kicinski 2022-04-08 1894 darg.zc = true;
fedf201e12960b Dave Watson 2019-01-30 1895
c0ab4732d4c658 Vakul Garg 2019-02-11 1896 /* Do not use async mode if record is non-data */
efb7d5ac289e35 Jakub Kicinski 2022-06-01 1897 if (ctx->control == TLS_RECORD_TYPE_DATA && !bpf_strp_enabled)
4175eac37123a6 Jakub Kicinski 2022-04-08 1898 darg.async = ctx->async_capable;
c0ab4732d4c658 Vakul Garg 2019-02-11 1899 else
4175eac37123a6 Jakub Kicinski 2022-04-08 1900 darg.async = false;
c0ab4732d4c658 Vakul Garg 2019-02-11 1901
6e7221f5f493c2 Jakub Kicinski 2022-05-26 1902 err = tls_decrypt_skb_update(sk, &msg->msg_iter, &darg);
3547a1f9d988d8 Jakub Kicinski 2022-04-11 1903 if (err < 0) {
f34f8f7258594f Jakub Kicinski 2022-03-12 1904 /* try to dodge memory failures */
f34f8f7258594f Jakub Kicinski 2022-03-12 1905 if (err != -ENOMEM || !(decrypted + copied))
da353fac65fede Daniel Jordan 2021-10-27 1906 tls_err_abort(sk, -EBADMSG);
fedf201e12960b Dave Watson 2019-01-30 1907 goto recv_end;
fedf201e12960b Dave Watson 2019-01-30 1908 }
fedf201e12960b Dave Watson 2019-01-30 1909
a7026cf1297903 Jakub Kicinski 2022-05-26 1910 skb = darg.skb;
6e7221f5f493c2 Jakub Kicinski 2022-05-26 1911
3547a1f9d988d8 Jakub Kicinski 2022-04-11 1912 async |= darg.async;
2b794c4098b525 Vakul Garg 2019-02-23 1913
2b794c4098b525 Vakul Garg 2019-02-23 1914 /* If the type of records being processed is not known yet,
2b794c4098b525 Vakul Garg 2019-02-23 1915 * set it to record type just dequeued. If it is already known,
2b794c4098b525 Vakul Garg 2019-02-23 1916 * but does not match the record type just dequeued, go to end.
2b794c4098b525 Vakul Garg 2019-02-23 1917 * We always get record type here since for tls1.2, record type
2b794c4098b525 Vakul Garg 2019-02-23 1918 * is known just after record is dequeued from stream parser.
2b794c4098b525 Vakul Garg 2019-02-23 1919 * For tls1.3, we disable async.
2b794c4098b525 Vakul Garg 2019-02-23 1920 */
efb7d5ac289e35 Jakub Kicinski 2022-06-01 1921 err = tls_record_content_type(msg, ctx->control, &control);
06fa4c1bf464a9 Jakub Kicinski 2022-05-26 1922 if (err <= 0) {
ee95a0f7b981ce Jakub Kicinski 2022-06-01 1923 tls_rx_rec_stow_prepare(ctx, skb);
06fa4c1bf464a9 Jakub Kicinski 2022-05-26 1924 put_on_rx_list_err:
06fa4c1bf464a9 Jakub Kicinski 2022-05-26 1925 __skb_queue_tail(&ctx->rx_list, skb);
c46234ebb4d1ee Dave Watson 2018-03-22 1926 goto recv_end;
06fa4c1bf464a9 Jakub Kicinski 2022-05-26 1927 }
b1a2c178633028 Jakub Kicinski 2022-04-08 1928
9bdf75ccffa690 Jakub Kicinski 2022-04-08 1929 if (async) {
9bdf75ccffa690 Jakub Kicinski 2022-04-08 1930 /* TLS 1.2-only, to_decrypt must be text length */
9bdf75ccffa690 Jakub Kicinski 2022-04-08 1931 chunk = min_t(int, to_decrypt, len);
ee95a0f7b981ce Jakub Kicinski 2022-06-01 1932 tls_rx_rec_stow_prepare(ctx, skb);
257fd01208cd4c Jakub Kicinski 2022-05-25 1933 put_on_rx_list:
f940b6efb17257 Jakub Kicinski 2022-04-08 1934 decrypted += chunk;
f940b6efb17257 Jakub Kicinski 2022-04-08 1935 len -= chunk;
257fd01208cd4c Jakub Kicinski 2022-05-25 1936 __skb_queue_tail(&ctx->rx_list, skb);
f940b6efb17257 Jakub Kicinski 2022-04-08 1937 continue;
9bdf75ccffa690 Jakub Kicinski 2022-04-08 1938 }
9bdf75ccffa690 Jakub Kicinski 2022-04-08 1939 /* TLS 1.3 may have updated the length by more than overhead */
03804ec62cc612 Jakub Kicinski 2022-06-02 1940 chunk = ctx->full_len;
c0ab4732d4c658 Vakul Garg 2019-02-11 1941
4175eac37123a6 Jakub Kicinski 2022-04-08 1942 if (!darg.zc) {
f940b6efb17257 Jakub Kicinski 2022-04-08 1943 bool partially_consumed = chunk > len;
03804ec62cc612 Jakub Kicinski 2022-06-02 1944 struct strp_msg *rxm;
f940b6efb17257 Jakub Kicinski 2022-04-08 1945
ee95a0f7b981ce Jakub Kicinski 2022-06-01 1946 tls_rx_rec_stow_prepare(ctx, skb);
ee95a0f7b981ce Jakub Kicinski 2022-06-01 1947
e91de6afa81c10 John Fastabend 2020-05-29 1948 if (bpf_strp_enabled) {
1c2133114d2d11 Jakub Kicinski 2022-05-18 1949 /* BPF may try to queue the skb */
e91de6afa81c10 John Fastabend 2020-05-29 1950 err = sk_psock_tls_strp_read(psock, skb);
e91de6afa81c10 John Fastabend 2020-05-29 1951 if (err != __SK_PASS) {
e91de6afa81c10 John Fastabend 2020-05-29 @1952 rxm->offset = rxm->offset + rxm->full_len;
e91de6afa81c10 John Fastabend 2020-05-29 1953 rxm->full_len = 0;
e91de6afa81c10 John Fastabend 2020-05-29 1954 if (err == __SK_DROP)
e91de6afa81c10 John Fastabend 2020-05-29 1955 consume_skb(skb);
e91de6afa81c10 John Fastabend 2020-05-29 1956 continue;
e91de6afa81c10 John Fastabend 2020-05-29 1957 }
e91de6afa81c10 John Fastabend 2020-05-29 1958 }
e91de6afa81c10 John Fastabend 2020-05-29 1959
f940b6efb17257 Jakub Kicinski 2022-04-08 1960 if (partially_consumed)
692d7b5d1f9125 Vakul Garg 2019-01-16 1961 chunk = len;
94524d8fc965a7 Vakul Garg 2018-08-29 1962
692d7b5d1f9125 Vakul Garg 2019-01-16 1963 err = skb_copy_datagram_msg(skb, rxm->offset,
692d7b5d1f9125 Vakul Garg 2019-01-16 1964 msg, chunk);
06fa4c1bf464a9 Jakub Kicinski 2022-05-26 1965 if (err < 0)
06fa4c1bf464a9 Jakub Kicinski 2022-05-26 1966 goto put_on_rx_list_err;
692d7b5d1f9125 Vakul Garg 2019-01-16 1967
f940b6efb17257 Jakub Kicinski 2022-04-08 1968 if (is_peek)
257fd01208cd4c Jakub Kicinski 2022-05-25 1969 goto put_on_rx_list;
f940b6efb17257 Jakub Kicinski 2022-04-08 1970
f940b6efb17257 Jakub Kicinski 2022-04-08 1971 if (partially_consumed) {
f940b6efb17257 Jakub Kicinski 2022-04-08 1972 rxm->offset += chunk;
f940b6efb17257 Jakub Kicinski 2022-04-08 1973 rxm->full_len -= chunk;
257fd01208cd4c Jakub Kicinski 2022-05-25 1974 goto put_on_rx_list;
692d7b5d1f9125 Vakul Garg 2019-01-16 1975 }
692d7b5d1f9125 Vakul Garg 2019-01-16 1976 }
c46234ebb4d1ee Dave Watson 2018-03-22 1977
692d7b5d1f9125 Vakul Garg 2019-01-16 1978 decrypted += chunk;
c46234ebb4d1ee Dave Watson 2018-03-22 1979 len -= chunk;
c46234ebb4d1ee Dave Watson 2018-03-22 1980
465ea73535675e Jakub Kicinski 2022-04-08 1981 consume_skb(skb);
465ea73535675e Jakub Kicinski 2022-04-08 1982
f940b6efb17257 Jakub Kicinski 2022-04-08 1983 /* Return full control message to userspace before trying
f940b6efb17257 Jakub Kicinski 2022-04-08 1984 * to parse another message type
c46234ebb4d1ee Dave Watson 2018-03-22 1985 */
c46234ebb4d1ee Dave Watson 2018-03-22 1986 msg->msg_flags |= MSG_EOR;
3fe16edf6767de Vadim Fedorenko 2020-11-15 1987 if (control != TLS_RECORD_TYPE_DATA)
f940b6efb17257 Jakub Kicinski 2022-04-08 1988 break;
04b25a5411f966 Jakub Kicinski 2019-05-24 1989 }
c46234ebb4d1ee Dave Watson 2018-03-22 1990
c46234ebb4d1ee Dave Watson 2018-03-22 1991 recv_end:
7da18bcc5e4cfd Jakub Kicinski 2022-04-08 1992 if (async) {
f314bfee81b1bf Jakub Kicinski 2022-04-11 1993 int ret, pending;
7da18bcc5e4cfd Jakub Kicinski 2022-04-08 1994
94524d8fc965a7 Vakul Garg 2018-08-29 1995 /* Wait for all previously submitted records to be decrypted */
0cada33241d9de Vinay Kumar Yadav 2020-05-23 1996 spin_lock_bh(&ctx->decrypt_compl_lock);
37943f047bfb88 Jakub Kicinski 2022-04-08 1997 reinit_completion(&ctx->async_wait.completion);
0cada33241d9de Vinay Kumar Yadav 2020-05-23 1998 pending = atomic_read(&ctx->decrypt_pending);
0cada33241d9de Vinay Kumar Yadav 2020-05-23 1999 spin_unlock_bh(&ctx->decrypt_compl_lock);
0cada33241d9de Vinay Kumar Yadav 2020-05-23 2000 if (pending) {
f314bfee81b1bf Jakub Kicinski 2022-04-11 2001 ret = crypto_wait_req(-EINPROGRESS, &ctx->async_wait);
f314bfee81b1bf Jakub Kicinski 2022-04-11 2002 if (ret) {
f314bfee81b1bf Jakub Kicinski 2022-04-11 2003 if (err >= 0 || err == -EINPROGRESS)
f314bfee81b1bf Jakub Kicinski 2022-04-11 2004 err = ret;
692d7b5d1f9125 Vakul Garg 2019-01-16 2005 decrypted = 0;
692d7b5d1f9125 Vakul Garg 2019-01-16 2006 goto end;
94524d8fc965a7 Vakul Garg 2018-08-29 2007 }
94524d8fc965a7 Vakul Garg 2018-08-29 2008 }
0cada33241d9de Vinay Kumar Yadav 2020-05-23 2009
692d7b5d1f9125 Vakul Garg 2019-01-16 2010 /* Drain records from the rx_list & copy if required */
692d7b5d1f9125 Vakul Garg 2019-01-16 2011 if (is_peek || is_kvec)
06554f4ffc2595 Jakub Kicinski 2022-04-08 2012 err = process_rx_list(ctx, msg, &control, copied,
692d7b5d1f9125 Vakul Garg 2019-01-16 2013 decrypted, false, is_peek);
692d7b5d1f9125 Vakul Garg 2019-01-16 2014 else
06554f4ffc2595 Jakub Kicinski 2022-04-08 2015 err = process_rx_list(ctx, msg, &control, 0,
692d7b5d1f9125 Vakul Garg 2019-01-16 2016 decrypted, true, is_peek);
4dcdd971b9c7a5 Jakub Kicinski 2022-04-11 2017 decrypted = max(err, 0);
94524d8fc965a7 Vakul Garg 2018-08-29 2018 }
94524d8fc965a7 Vakul Garg 2018-08-29 2019
692d7b5d1f9125 Vakul Garg 2019-01-16 2020 copied += decrypted;
692d7b5d1f9125 Vakul Garg 2019-01-16 2021
692d7b5d1f9125 Vakul Garg 2019-01-16 2022 end:
c46234ebb4d1ee Dave Watson 2018-03-22 2023 release_sock(sk);
d3b18ad31f93d0 John Fastabend 2018-10-13 2024 if (psock)
d3b18ad31f93d0 John Fastabend 2018-10-13 2025 sk_psock_put(sk, psock);
c46234ebb4d1ee Dave Watson 2018-03-22 2026 return copied ? : err;
c46234ebb4d1ee Dave Watson 2018-03-22 2027 }
c46234ebb4d1ee Dave Watson 2018-03-22 2028

:::::: The code at line 1952 was first introduced by commit
:::::: e91de6afa81c10e9f855c5695eb9a53168d96b73 bpf: Fix running sk_skb program types with ktls

:::::: TO: John Fastabend <john.fastabend@xxxxxxxxx>
:::::: CC: Alexei Starovoitov <ast@xxxxxxxxxx>

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