Forwarded: [PATCH] exec: do not call sched_mm_cid_after_execve() on exec fail

[syzbot <syzbot+9ca2c6e6b098bf5ae60a@syzkaller.appspotmail.com>]

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***

Subject: [PATCH] exec: do not call sched_mm_cid_after_execve() on exec fail
Author: wangjinchao600@gmail.com

sched_mm_cid_after_execve() is called from the failure path
of bprm_execve(). At that point exec has not completed successfully,
so updating the mm CID state is incorrect and can trigger a panic,
as reported by syzbot.

Remove the call from the exec failure path.

#syz test

Cc: stable@vger.kernel.org
Reported-by: syzbot+9ca2c6e6b098bf5ae60a@syzkaller.appspotmail.com
Signed-off-by: Jinchao Wang <wangjinchao600@gmail.com>
---
 fs/exec.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/fs/exec.c b/fs/exec.c
index 9d5ebc9d15b0..9044a75d26ab 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1773,7 +1773,6 @@ static int bprm_execve(struct linux_binprm *bprm)
 	if (bprm->point_of_no_return && !fatal_signal_pending(current))
 		force_fatal_sig(SIGSEGV);
 
-	sched_mm_cid_after_execve(current);
 	rseq_force_update();
 	current->in_execve = 0;
 
-- 
2.43.0