This is a note to let you know that I've just added the patch titled
ipc: set msg back to -EAGAIN if copy wasn't performed
to the 3.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ipc-set-msg-back-to-eagain-if-copy-wasn-t-performed.patch
and it can be found in the queue-3.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 2dc958fa2fe6987e7ab106bd97029a09a82fcd8d Mon Sep 17 00:00:00 2001
From: Stanislav Kinsbursky <skinsbursky@xxxxxxxxxxxxx>
Date: Mon, 1 Apr 2013 11:40:51 +0400
Subject: ipc: set msg back to -EAGAIN if copy wasn't performed
From: Stanislav Kinsbursky <skinsbursky@xxxxxxxxxxxxx>
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 <skinsbursky@xxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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++;
Patches currently in stable-queue which might be from skinsbursky@xxxxxxxxxxxxx are
queue-3.8/ipc-set-msg-back-to-eagain-if-copy-wasn-t-performed.patch
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