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| author |   Linus Torvalds <torvalds@linux-foundation.org> | 2020-06-10 15:00:11 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-06-10 15:00:11 -0700 |
| commit | 79ca035d2d941839f55f3b8b69f8e81c66946ed8 (patch) | |
| tree | fc760528b0b60073642ceaff66b7f942251a6ff1 /fs/proc | |
| parent | Merge branch 'rwonce/rework' of git://git.kernel.org/pub/scm/linux/kernel/git/will/linux (diff) | |
| parent | proc: s_fs_info may be NULL when proc_kill_sb is called (diff) | |
| download | linux-dev-79ca035d2d941839f55f3b8b69f8e81c66946ed8.tar.xz linux-dev-79ca035d2d941839f55f3b8b69f8e81c66946ed8.zip | |
Merge branch 'proc-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
Pull proc fix from Eric Biederman:
"Syzbot found a NULL pointer dereference if kzalloc of s_fs_info fails"
* 'proc-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace:
proc: s_fs_info may be NULL when proc_kill_sb is called
Diffstat (limited to 'fs/proc')
| -rw-r--r-- | fs/proc/root.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/fs/proc/root.c b/fs/proc/root.c index ffebed1999e5..5e444d4f9717 100644 --- a/fs/proc/root.c +++ b/fs/proc/root.c @@ -264,11 +264,13 @@ static void proc_kill_sb(struct super_block *sb) { struct proc_fs_info *fs_info = proc_sb_info(sb); - if (fs_info->proc_self) - dput(fs_info->proc_self); + if (!fs_info) { + kill_anon_super(sb); + return; + } - if (fs_info->proc_thread_self) - dput(fs_info->proc_thread_self); + dput(fs_info->proc_self); + dput(fs_info->proc_thread_self); kill_anon_super(sb); put_pid_ns(fs_info->pid_ns); |