linux-kernel - BUG in sys

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Date:	Thu, 25 Oct 2007 10:11:07 -0400
From:	Rich Paul <socketpair_bug@...h-paul.net>
To:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: BUG in sys_socketpair

In 2.6.23, there seems to be a minor bug in sys_socketpair.  When the
calls to sock_alloc_fd fail, it aborts the routine, but it returns the
variable err, which is not set in this case.

The result is a silent failure if you have too many files open and call
socketpair.

Here is a simple UNTESTED patch (not even compiled) which should resolve the
issue.

Regards,
Rich

--- net/socket.c.orig   2007-10-25 10:03:56.000000000 -0400
+++ net/socket.c        2007-10-25 10:04:00.000000000 -0400
@@ -1245,11 +1245,14 @@
                goto out_release_both;

        fd1 = sock_alloc_fd(&newfile1);
-       if (unlikely(fd1 < 0))
+       if (unlikely(fd1 < 0)) {
+               err=fd1;
                goto out_release_both;
+       }

        fd2 = sock_alloc_fd(&newfile2);
        if (unlikely(fd2 < 0)) {
+               err=fd2;
                put_filp(newfile1);
                put_unused_fd(fd1);
                goto out_release_both;

-
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