From: Sasha Levin Date: Thu, 4 Oct 2012 19:57:31 -0400 Subject: fs: handle failed audit_log_start properly commit d1c7d97ad58836affde6e39980b96527510b572e upstream. audit_log_start() may return NULL, this is unchecked by the caller in audit_log_link_denied() and could cause a NULL ptr deref. Introduced by commit a51d9eaa ("fs: add link restriction audit reporting"). Signed-off-by: Sasha Levin Signed-off-by: Al Viro --- kernel/audit.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/audit.c b/kernel/audit.c index 4d0ceed..40414e9 100644 --- a/kernel/audit.c +++ b/kernel/audit.c @@ -1440,6 +1440,8 @@ void audit_log_link_denied(const char *operation, struct path *link) ab = audit_log_start(current->audit_context, GFP_KERNEL, AUDIT_ANOM_LINK); + if (!ab) + return; audit_log_format(ab, "op=%s action=denied", operation); audit_log_format(ab, " pid=%d comm=", current->pid); audit_log_untrustedstring(ab, current->comm);