Commit 79ca035d authored Jun 10, 2020 by Linus Torvalds

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

parents 4152d146 058f2e4d

fs/proc/root.c

+6 −4

Original line number	Diff line number	Diff line
		@@ -264,10 +264,12 @@ 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_self);
		dput(fs_info->proc_thread_self);

		kill_anon_super(sb);

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