ipc: fix potential oops when src msg > 4k w/ MSG_COPY

If the src msg is > 4k, then dest->next points to the
next allocated segment; resetting it just prior to dereferencing
is bad.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Acked-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/ipc/msgutil.c b/ipc/msgutil.c
index ebfcbfa8b7f25a4193dcfd196963e4b87428a6e6..5df8e4bf1db00debfedc37a3487cfddc612126ad 100644 (file)
--- a/ipc/msgutil.c
+++ b/ipc/msgutil.c
@@ -117,9 +117,6 @@ struct msg_msg *copy_msg(struct msg_msg *src, struct msg_msg *dst)
        if (alen > DATALEN_MSG)
                alen = DATALEN_MSG;
 
-       dst->next = NULL;
-       dst->security = NULL;
-
        memcpy(dst + 1, src + 1, alen);
 
        len -= alen;