[hare-scsi-devel:tls-upcall.v4 152/156] net/tls/af_tlsh.c:647:6: warning: variable 'outlen' is used uninitialized whenever 'if' condition is true
From: kernel test robot
Date: Sun Mar 13 2022 - 11:17:50 EST
tree: https://git.kernel.org/pub/scm/linux/kernel/git/hare/scsi-devel.git tls-upcall.v4
head: d2416ecdb6b03fc2e4aa40b20cdf919322713224
commit: 90c95b5f64cbdc8e88523332e8c28796669b2db1 [152/156] af_tlsh: allocate priorities string
config: i386-randconfig-a015 (https://download.01.org/0day-ci/archive/20220313/202203132353.gVyyCtsm-lkp@xxxxxxxxx/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 0467eb2cb7654c15ae366967ef35093c5724c416)
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/hare/scsi-devel.git/commit/?id=90c95b5f64cbdc8e88523332e8c28796669b2db1
git remote add hare-scsi-devel https://git.kernel.org/pub/scm/linux/kernel/git/hare/scsi-devel.git
git fetch --no-tags hare-scsi-devel tls-upcall.v4
git checkout 90c95b5f64cbdc8e88523332e8c28796669b2db1
# save the config file to linux build tree
mkdir build_dir
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash net/tls/
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>
All warnings (new ones prefixed by >>):
>> net/tls/af_tlsh.c:647:6: warning: variable 'outlen' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
if (val) {
^~~
net/tls/af_tlsh.c:659:15: note: uninitialized use occurs here
if (put_user(outlen, optlen))
^~~~~~
arch/x86/include/asm/uaccess.h:252:70: note: expanded from macro 'put_user'
#define put_user(x, ptr) ({ might_fault(); do_put_user_call(put_user,x,ptr); })
^
arch/x86/include/asm/uaccess.h:224:14: note: expanded from macro 'do_put_user_call'
__val_pu = (x); \
^
net/tls/af_tlsh.c:647:2: note: remove the 'if' if its condition is always false
if (val) {
^~~~~~~~~~
net/tls/af_tlsh.c:623:12: note: initialize the variable 'outlen' to silence this warning
int outlen, len, ret;
^
= 0
1 warning generated.
vim +647 net/tls/af_tlsh.c
33ec82590b0b91 Chuck Lever 2021-11-19 618
33ec82590b0b91 Chuck Lever 2021-11-19 619 static int tlsh_getsockopt_priorities(struct sock *sk, char __user *optval,
33ec82590b0b91 Chuck Lever 2021-11-19 620 int __user *optlen)
33ec82590b0b91 Chuck Lever 2021-11-19 621 {
33ec82590b0b91 Chuck Lever 2021-11-19 622 struct tlsh_sock_info *info;
33ec82590b0b91 Chuck Lever 2021-11-19 623 int outlen, len, ret;
33ec82590b0b91 Chuck Lever 2021-11-19 624 const char *val;
33ec82590b0b91 Chuck Lever 2021-11-19 625
33ec82590b0b91 Chuck Lever 2021-11-19 626 if (get_user(len, optlen))
33ec82590b0b91 Chuck Lever 2021-11-19 627 return -EFAULT;
33ec82590b0b91 Chuck Lever 2021-11-19 628 if (!optval)
33ec82590b0b91 Chuck Lever 2021-11-19 629 return -EINVAL;
33ec82590b0b91 Chuck Lever 2021-11-19 630
33ec82590b0b91 Chuck Lever 2021-11-19 631 ret = 0;
33ec82590b0b91 Chuck Lever 2021-11-19 632
33ec82590b0b91 Chuck Lever 2021-11-19 633 sock_hold(sk);
33ec82590b0b91 Chuck Lever 2021-11-19 634 write_lock_bh(&sk->sk_callback_lock);
33ec82590b0b91 Chuck Lever 2021-11-19 635
33ec82590b0b91 Chuck Lever 2021-11-19 636 info = sk->sk_tlsh_priv;
33ec82590b0b91 Chuck Lever 2021-11-19 637 if (info) {
33ec82590b0b91 Chuck Lever 2021-11-19 638 val = info->tsi_tls_priorities;
33ec82590b0b91 Chuck Lever 2021-11-19 639 } else {
33ec82590b0b91 Chuck Lever 2021-11-19 640 write_unlock_bh(&sk->sk_callback_lock);
33ec82590b0b91 Chuck Lever 2021-11-19 641 ret = -EBUSY;
33ec82590b0b91 Chuck Lever 2021-11-19 642 goto out_put;
33ec82590b0b91 Chuck Lever 2021-11-19 643 }
33ec82590b0b91 Chuck Lever 2021-11-19 644
33ec82590b0b91 Chuck Lever 2021-11-19 645 write_unlock_bh(&sk->sk_callback_lock);
33ec82590b0b91 Chuck Lever 2021-11-19 646
33ec82590b0b91 Chuck Lever 2021-11-19 @647 if (val) {
33ec82590b0b91 Chuck Lever 2021-11-19 648 int outlen = strlen(val);
33ec82590b0b91 Chuck Lever 2021-11-19 649
90c95b5f64cbdc Hannes Reinecke 2022-03-10 650 if (len < outlen)
33ec82590b0b91 Chuck Lever 2021-11-19 651 ret = -EINVAL;
90c95b5f64cbdc Hannes Reinecke 2022-03-10 652 else if (copy_to_user(optval, val, outlen))
90c95b5f64cbdc Hannes Reinecke 2022-03-10 653 ret = -EFAULT;
33ec82590b0b91 Chuck Lever 2021-11-19 654 } else {
33ec82590b0b91 Chuck Lever 2021-11-19 655 outlen = 0;
33ec82590b0b91 Chuck Lever 2021-11-19 656 }
33ec82590b0b91 Chuck Lever 2021-11-19 657
90c95b5f64cbdc Hannes Reinecke 2022-03-10 658
90c95b5f64cbdc Hannes Reinecke 2022-03-10 659 if (put_user(outlen, optlen))
33ec82590b0b91 Chuck Lever 2021-11-19 660 ret = -EFAULT;
33ec82590b0b91 Chuck Lever 2021-11-19 661
33ec82590b0b91 Chuck Lever 2021-11-19 662 out_put:
33ec82590b0b91 Chuck Lever 2021-11-19 663 sock_put(sk);
33ec82590b0b91 Chuck Lever 2021-11-19 664 return ret;
33ec82590b0b91 Chuck Lever 2021-11-19 665 }
33ec82590b0b91 Chuck Lever 2021-11-19 666
:::::: The code at line 647 was first introduced by commit
:::::: 33ec82590b0b919215a255fb431d661be4807b45 net/tls: Add support for PF_TLSH (a TLS handshake listener)
:::::: TO: Chuck Lever <chuck.lever@xxxxxxxxxx>
:::::: CC: Hannes Reinecke <hare@xxxxxxx>
---
0-DAY CI Kernel Test Service
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx