3.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: Stanislav Kinsbursky <skinsbur...@parallels.com>
commit 2dc958fa2fe6987e7ab106bd97029a09a82fcd8d upstream.
Make sure that msg pointer is set back to error value in case of
MSG_COPY flag is set and desired message to copy wasn't found. This
garantees that msg is either a error pointer or a copy address.
Otherwise the last message in queue will be freed without unlinking from
the queue (which leads to memory corruption) and the dummy allocated
copy won't be released.
Signed-off-by: Stanislav Kinsbursky <skinsbur...@parallels.com>
Signed-off-by: Linus Torvalds <torva...@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
ipc/msg.c | 1 +
1 file changed, 1 insertion(+)
--- a/ipc/msg.c
+++ b/ipc/msg.c
@@ -872,6 +872,7 @@ long do_msgrcv(int msqid, void __user *b
goto out_unlock;
break;
}
+ msg = ERR_PTR(-EAGAIN);
} else
break;
msg_counter++;
--
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