ipc: set msg back to -EAGAIN if copy wasn't performed
Stanislav Kinsbursky [Mon, 1 Apr 2013 07:40:51 +0000 (11:40 +0400)]
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@parallels.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

ipc/msg.c

index 31cd1bf..fede1d0 100644 (file)
--- 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++;