linux-kernel - Re: Kernel BUG: NULL pointer dereference , reference to sys

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Date:	Thu, 10 May 2007 14:21:38 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	cebbert@...hat.com
Cc:	croulder@...il.com, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: Kernel BUG: NULL pointer dereference , reference to sys_recvmsg

From: Chuck Ebbert <cebbert@...hat.com>
Date: Thu, 10 May 2007 17:07:46 -0400

> Here in sys_recvmsg() line 1911:
> 
> ==>     if (sock->file->f_flags & O_NONBLOCK)
>                 flags |= MSG_DONTWAIT;
>         err = sock_recvmsg(sock, &msg_sys, total_len, flags);
> 
> sock == -1, apparently because that's what sockfd_lookup_light() 
> returned earlier in the function. (It doesn't check err, just
> that the returned sock is nonzero.)

sockfd_lookup_light() returns NULL in all cases where 'err'
is set non-zero.

I suspect file->private_data has been corrupted somehow.
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