integrity: check the return value of audit_log_start()

commit 83230351c523b04ff8a029a4bdf97d881ecb96fc upstream.

audit_log_start() returns audit_buffer pointer on success or NULL on
error, so it is better to check the return value of it.

Fixes: 3323eec921ef ("integrity: IMA as an integrity service provider")
Signed-off-by: Xiaoke Wang <xkernel.wang@foxmail.com>
Cc: <stable@vger.kernel.org>
Reviewed-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/security/integrity/integrity_audit.c b/security/integrity/integrity_audit.c
index 90987d15b6fe6c01ca593e185d2ae7a780186c31..6c415667ba67f0e4bf96a45aee1cae11e4153f7b 100644 (file)
--- a/security/integrity/integrity_audit.c
+++ b/security/integrity/integrity_audit.c
@@ -39,6 +39,8 @@ void integrity_audit_msg(int audit_msgno, struct inode *inode,
                return;
 
        ab = audit_log_start(current->audit_context, GFP_KERNEL, audit_msgno);
+       if (!ab)
+               return;
        audit_log_format(ab, "pid=%d uid=%u auid=%u ses=%u",
                         task_pid_nr(current),
                         from_kuid(&init_user_ns, current_cred()->uid),