From 2dc958fa2fe6987e7ab106bd97029a09a82fcd8d Mon Sep 17 00:00:00 2001 From: Stanislav Kinsbursky Date: Mon, 1 Apr 2013 11:40:51 +0400 Subject: ipc: set msg back to -EAGAIN if copy wasn't performed 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 Signed-off-by: Linus Torvalds --- ipc/msg.c | 1 + 1 file changed, 1 insertion(+) (limited to 'ipc/msg.c') diff --git a/ipc/msg.c b/ipc/msg.c index 31cd1bf6af2..fede1d06ef3 100644 --- a/ipc/msg.c +++ b/ipc/msg.c @@ -872,6 +872,7 @@ long do_msgrcv(int msqid, void __user *buf, size_t bufsz, long msgtyp, goto out_unlock; break; } + msg = ERR_PTR(-EAGAIN); } else break; msg_counter++; -- cgit v1.2.3