audit: check the length of userspace generated audit records

[sfrench/cifs-2.6.git] / kernel / audit.c

diff --git a/kernel/audit.c b/kernel/audit.c
index b69c8b460341f5698ec518d8539df7f0904d22c6..87f31bf1f0a0c80304a6ff82cc4207aee1194ca7 100644 (file)
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -1326,6 +1326,9 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
        case AUDIT_FIRST_USER_MSG2 ... AUDIT_LAST_USER_MSG2:
                if (!audit_enabled && msg_type != AUDIT_USER_AVC)
                        return 0;
+               /* exit early if there isn't at least one character to print */
+               if (data_len < 2)
+                       return -EINVAL;
 
                err = audit_filter(msg_type, AUDIT_FILTER_USER);
                if (err == 1) { /* match or error */