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fs: handle failed audit_log_start properly

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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 <sasha.levin@oracle.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Sasha Levin 2012-10-04 19:57:31 -04:00 committed by Al Viro
parent ffd8d101a3
commit d1c7d97ad5
1 changed files with 2 additions and 0 deletions
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2
kernel/audit.c
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@ -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);