[ 057/100] ipc: fix potential oops when src msg > 4k w/ MSG_COPY

[Greg Kroah-Hartman]

3.8-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Peter Hurley <peter@xxxxxxxxxxxxxxxxxx>

commit e1082f45f1e2bbf6e25f6b614fc6616ebf709d19 upstream.

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@xxxxxxxxxxxxxxxxxx>
Acked-by: Stanislav Kinsbursky <skinsbursky@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 ipc/msgutil.c |    3 ---
 1 file changed, 3 deletions(-)

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


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