[linux-stable-rc:linux-4.4.y 1224/1774] net/core/skbuff.c:1523:32: warning: comparison of integer expressions of different signedness: 'long unsigned int' and 'int'

From: kernel test robot
Date: Sun Jul 11 2021 - 01:03:11 EST

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tree: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-4.4.y
head: 38c92ba3580f0d00e57a55caf8f880aa1a0f2a50
commit: 2555bb2a5163e3741d5dd5916f3a9f0228750aca [1224/1774] net: drop bogus skb with CHECKSUM_PARTIAL and offset beyond end of trimmed packet
config: mips-randconfig-r013-20210705 (attached as .config)
compiler: mips64el-linux-gcc (GCC) 9.3.0
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
# https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git/commit/?id=2555bb2a5163e3741d5dd5916f3a9f0228750aca
git remote add linux-stable-rc https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git
git fetch --no-tags linux-stable-rc linux-4.4.y
git checkout 2555bb2a5163e3741d5dd5916f3a9f0228750aca
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=mips

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

All warnings (new ones prefixed by >>):

In file included from include/net/sock.h:51,
from include/linux/tcp.h:22,
from net/core/skbuff.c:50:
include/linux/netdevice.h: In function 'netif_msg_init':
include/linux/netdevice.h:3304:37: warning: comparison of integer expressions of different signedness: 'int' and 'long unsigned int' [-Wsign-compare]
3304 | if (debug_value < 0 || debug_value >= (sizeof(u32) * 8))
| ^~
In file included from include/net/rtnetlink.h:5,
from include/net/sch_generic.h:12,
from include/linux/filter.h:16,
from include/net/sock.h:62,
from include/linux/tcp.h:22,
from net/core/skbuff.c:50:
include/net/netlink.h: In function 'nlmsg_ok':
include/net/netlink.h:337:18: warning: comparison of integer expressions of different signedness: '__u32' {aka 'const unsigned int'} and 'int' [-Wsign-compare]
337 | nlh->nlmsg_len <= remaining);
| ^~
include/net/netlink.h: In function 'nlmsg_parse':
include/net/netlink.h:372:21: warning: comparison of integer expressions of different signedness: '__u32' {aka 'const unsigned int'} and 'int' [-Wsign-compare]
372 | if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen))
| ^
include/net/netlink.h: In function 'nlmsg_validate':
include/net/netlink.h:405:21: warning: comparison of integer expressions of different signedness: '__u32' {aka 'const unsigned int'} and 'int' [-Wsign-compare]
405 | if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen))
| ^
In file included from include/net/sch_generic.h:12,
from include/linux/filter.h:16,
from include/net/sock.h:62,
from include/linux/tcp.h:22,
from net/core/skbuff.c:50:
include/net/rtnetlink.h: In function 'rtnl_msg_family':
include/net/rtnetlink.h:20:21: warning: comparison of integer expressions of different signedness: 'int' and 'long unsigned int' [-Wsign-compare]
20 | if (nlmsg_len(nlh) >= sizeof(struct rtgenmsg))
| ^~
In file included from include/uapi/linux/stddef.h:1,
from include/linux/stddef.h:4,
from include/uapi/linux/posix_types.h:4,
from include/uapi/linux/types.h:13,
from include/linux/types.h:5,
from include/linux/list.h:4,
from include/linux/module.h:9,
from net/core/skbuff.c:41:
include/net/sch_generic.h: In function 'qdisc_cb_private_validate':
include/net/sch_generic.h:267:33: warning: comparison of integer expressions of different signedness: 'long unsigned int' and 'int' [-Wsign-compare]
267 | BUILD_BUG_ON(sizeof(qcb->data) < sz);
| ^
include/linux/compiler.h:491:19: note: in definition of macro '__compiletime_assert'
491 | bool __cond = !(condition); \
| ^~~~~~~~~
include/linux/compiler.h:511:2: note: in expansion of macro '_compiletime_assert'
511 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
| ^~~~~~~~~~~~~~~~~~~
include/linux/bug.h:50:37: note: in expansion of macro 'compiletime_assert'
50 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
| ^~~~~~~~~~~~~~~~~~
include/linux/bug.h:74:2: note: in expansion of macro 'BUILD_BUG_ON_MSG'
74 | BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
| ^~~~~~~~~~~~~~~~
include/net/sch_generic.h:267:2: note: in expansion of macro 'BUILD_BUG_ON'
267 | BUILD_BUG_ON(sizeof(qcb->data) < sz);
| ^~~~~~~~~~~~
In file included from include/net/sock.h:62,
from include/linux/tcp.h:22,
from net/core/skbuff.c:50:
include/linux/filter.h: In function 'bpf_needs_clear_a':
include/linux/filter.h:517:16: warning: comparison of integer expressions of different signedness: '__u32' {aka 'const unsigned int'} and 'int' [-Wsign-compare]
517 | if (first->k == SKF_AD_OFF + SKF_AD_ALU_XOR_X)
| ^~
In file included from include/linux/tcp.h:22,
from net/core/skbuff.c:50:
include/net/sock.h: In function 'skb_do_copy_data_nocache':
include/net/sock.h:1838:54: warning: comparison of integer expressions of different signedness: 'size_t' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
1838 | if (csum_and_copy_from_iter(to, copy, &csum, from) != copy)
| ^~
include/net/sock.h:1842:46: warning: comparison of integer expressions of different signedness: 'size_t' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
1842 | if (copy_from_iter_nocache(to, copy, from) != copy)
| ^~
include/net/sock.h:1844:44: warning: comparison of integer expressions of different signedness: 'size_t' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
1844 | } else if (copy_from_iter(to, copy, from) != copy)
| ^~
In file included from include/linux/tcp.h:23,
from net/core/skbuff.c:50:
include/net/inet_connection_sock.h: In function 'inet_csk_reqsk_queue_is_full':
include/net/inet_connection_sock.h:294:38: warning: comparison of integer expressions of different signedness: 'int' and 'u32' {aka 'const unsigned int'} [-Wsign-compare]
294 | return inet_csk_reqsk_queue_len(sk) >= sk->sk_max_ack_backlog;
| ^~
net/core/skbuff.c: In function '___pskb_trim':
net/core/skbuff.c:1440:13: warning: comparison of integer expressions of different signedness: 'int' and 'unsigned int' [-Wsign-compare]
1440 | if (offset >= len)
| ^~
net/core/skbuff.c:1446:11: warning: comparison of integer expressions of different signedness: 'int' and 'unsigned int' [-Wsign-compare]
1446 | if (end < len) {
| ^
net/core/skbuff.c:1481:11: warning: comparison of integer expressions of different signedness: 'int' and 'unsigned int' [-Wsign-compare]
1481 | if (end < len) {
| ^
net/core/skbuff.c:1486:11: warning: comparison of integer expressions of different signedness: 'int' and 'unsigned int' [-Wsign-compare]
1486 | if (end > len &&
| ^
net/core/skbuff.c: In function 'pskb_trim_rcsum_slow':
>> net/core/skbuff.c:1523:32: warning: comparison of integer expressions of different signedness: 'long unsigned int' and 'int' [-Wsign-compare]
1523 | if (offset + sizeof(__sum16) > hdlen)
| ^
net/core/skbuff.c: In function '__pskb_pull_tail':
net/core/skbuff.c:1603:18: warning: comparison of integer expressions of different signedness: 'unsigned int' and 'int' [-Wsign-compare]
1603 | if (list->len <= eat) {
| ^~
net/core/skbuff.c: In function 'skb_split_no_header':
net/core/skbuff.c:2571:18: warning: comparison of integer expressions of different signedness: 'int' and 'u32' {aka 'const unsigned int'} [-Wsign-compare]
2571 | if (pos + size > len) {
| ^
net/core/skbuff.c:2574:12: warning: comparison of integer expressions of different signedness: 'int' and 'u32' {aka 'const unsigned int'} [-Wsign-compare]
2574 | if (pos < len) {
| ^
net/core/skbuff.c: In function 'skb_split':
net/core/skbuff.c:2609:10: warning: comparison of integer expressions of different signedness: 'u32' {aka 'const unsigned int'} and 'int' [-Wsign-compare]
2609 | if (len < pos) /* Split line is inside header. */
| ^
In file included from include/linux/bug.h:4,
from include/linux/thread_info.h:11,
from include/asm-generic/preempt.h:4,
from arch/mips/include/generated/asm/preempt.h:1,
from include/linux/preempt.h:59,
from include/linux/spinlock.h:50,
from include/linux/seqlock.h:35,
from include/linux/time.h:5,
from include/linux/stat.h:18,
from include/linux/module.h:10,
from net/core/skbuff.c:41:
net/core/skbuff.c: In function 'skb_shift':
net/core/skbuff.c:2648:18: warning: comparison of integer expressions of different signedness: 'int' and 'unsigned int' [-Wsign-compare]
2648 | BUG_ON(shiftlen > skb->len);
| ^
arch/mips/include/asm/bug.h:33:44: note: in definition of macro 'BUG_ON'
33 | #define BUG_ON(C) __BUG_ON((unsigned long)(C))
| ^
net/core/skbuff.c:2687:16: warning: comparison of integer expressions of different signedness: 'int' and 'unsigned int' [-Wsign-compare]
2687 | if ((shiftlen == skb->len) &&
| ^~
net/core/skbuff.c:2688:41: warning: comparison of integer expressions of different signedness: 'int' and 'long unsigned int' [-Wsign-compare]
2688 | (skb_shinfo(skb)->nr_frags - from) > (MAX_SKB_FRAGS - to))
| ^
net/core/skbuff.c:2701:12: warning: comparison of integer expressions of different signedness: 'int' and 'unsigned int' [-Wsign-compare]
2701 | if (todo >= skb_frag_size(fragfrom)) {
| ^~
net/core/skbuff.c: In function 'skb_append_datato_frags':
net/core/skbuff.c:2952:15: warning: comparison of integer expressions of different signedness: 'int' and 'long unsigned int' [-Wsign-compare]
2952 | if (frg_cnt >= MAX_SKB_FRAGS)
| ^~
net/core/skbuff.c: In function 'skb_append_pagefrags':
net/core/skbuff.c:2993:15: warning: comparison of integer expressions of different signedness: 'int' and 'long unsigned int' [-Wsign-compare]
2993 | } else if (i < MAX_SKB_FRAGS) {
| ^
net/core/skbuff.c: In function 'skb_segment':
net/core/skbuff.c:3082:13: warning: comparison of integer expressions of different signedness: 'int' and 'unsigned int' [-Wsign-compare]
3082 | if (hsize > len || !sg)
| ^
net/core/skbuff.c:3095:15: warning: comparison of integer expressions of different signedness: 'int' and 'unsigned int' [-Wsign-compare]
3095 | while (pos < offset + len) {
| ^
net/core/skbuff.c:3099:20: warning: comparison of integer expressions of different signedness: 'int' and 'unsigned int' [-Wsign-compare]
3099 | if (pos + size > offset + len)
| ^
net/core/skbuff.c:3175:14: warning: comparison of integer expressions of different signedness: 'int' and 'unsigned int' [-Wsign-compare]
3175 | while (pos < offset + len) {
| ^
net/core/skbuff.c:3204:12: warning: comparison of integer expressions of different signedness: 'int' and 'unsigned int' [-Wsign-compare]
3204 | if (pos < offset) {
| ^
net/core/skbuff.c:3211:19: warning: comparison of integer expressions of different signedness: 'int' and 'unsigned int' [-Wsign-compare]
3211 | if (pos + size <= offset + len) {
| ^~
net/core/skbuff.c: In function 'skb_gro_receive':
net/core/skbuff.c:3282:16: warning: comparison of integer expressions of different signedness: 'int' and 'long unsigned int' [-Wsign-compare]
3282 | if (nr_frags > MAX_SKB_FRAGS)
| ^
net/core/skbuff.c:3315:40: warning: comparison of integer expressions of different signedness: 'int' and 'long unsigned int' [-Wsign-compare]
3315 | if (nr_frags + 1 + skbinfo->nr_frags > MAX_SKB_FRAGS)
| ^
net/core/skbuff.c: In function 'alloc_skb_with_frags':
net/core/skbuff.c:4540:13: warning: comparison of integer expressions of different signedness: 'int' and 'long unsigned int' [-Wsign-compare]
4540 | if (npages > MAX_SKB_FRAGS)
| ^
In file included from arch/mips/include/asm/atomic.h:22,
from include/linux/atomic.h:4,
from include/linux/debug_locks.h:5,
from include/linux/lockdep.h:23,
from include/linux/spinlock_types.h:18,
from include/linux/spinlock.h:81,
from include/linux/seqlock.h:35,
from include/linux/time.h:5,
from include/linux/stat.h:18,
from include/linux/module.h:10,
from net/core/skbuff.c:41:
arch/mips/include/asm/atomic.h: In function '__atomic_add_unless':
arch/mips/include/asm/cmpxchg.h:212:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
212 | if (sizeof(long) == 8) { \
| ^
arch/mips/include/asm/cmpxchg.h:227:33: note: in expansion of macro '__cmpxchg'
227 | #define cmpxchg(ptr, old, new) __cmpxchg(ptr, old, new, smp_mb__before_llsc(), smp_llsc_mb())
| ^~~~~~~~~

vim +1523 net/core/skbuff.c

1508
1509 /* Note : use pskb_trim_rcsum() instead of calling this directly
1510 */
1511 int pskb_trim_rcsum_slow(struct sk_buff *skb, unsigned int len)
1512 {
1513 if (skb->ip_summed == CHECKSUM_COMPLETE) {
1514 int delta = skb->len - len;
1515
1516 skb->csum = csum_block_sub(skb->csum,
1517 skb_checksum(skb, len, delta, 0),
1518 len);
1519 } else if (skb->ip_summed == CHECKSUM_PARTIAL) {
1520 int hdlen = (len > skb_headlen(skb)) ? skb_headlen(skb) : len;
1521 int offset = skb_checksum_start_offset(skb) + skb->csum_offset;
1522
> 1523 if (offset + sizeof(__sum16) > hdlen)
1524 return -EINVAL;
1525 }
1526 return __pskb_trim(skb, len);
1527 }
1528 EXPORT_SYMBOL(pskb_trim_rcsum_slow);
1529

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx

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