linux-kernel - [ 11/27] ipc: set msg back to -EAGAIN if copy wasnt performed

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Date:	Sun, 14 Apr 2013 19:43:10 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Stanislav Kinsbursky <skinsbursky@...allels.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [ 11/27] ipc: set msg back to -EAGAIN if copy wasnt performed

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

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

From: Stanislav Kinsbursky <skinsbursky@...allels.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 <skinsbursky@...allels.com>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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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