linux-kernel - Re: [PATCH] net: Fix references to out-of-scope variables in put_cmsg

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Message-Id: <20120722.145407.2163219263880320745.davem@davemloft.net>
Date:	Sun, 22 Jul 2012 14:54:07 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	jj@...osbits.net
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: Fix references to out-of-scope variables in
 put_cmsg_compat()

From: Jesper Juhl <jj@...osbits.net>
Date: Sun, 22 Jul 2012 23:37:20 +0200 (CEST)

> In net/compat.c::put_cmsg_compat() we may assign 'data' the address of
> either the 'ctv' or 'cts' local variables inside the 'if
> (!COMPAT_USE_64BIT_TIME)' branch.
> 
> Those variables go out of scope at the end of the 'if' statement, so
> when we use 'data' further down in 'copy_to_user(CMSG_COMPAT_DATA(cm),
> data, cmlen - sizeof(struct compat_cmsghdr))' there's no telling what
> it may be refering to - not good.
> 
> Fix the problem by simply giving 'ctv' and 'cts' function scope.
> 
> Signed-off-by: Jesper Juhl <jj@...osbits.net>

Applied and queued up for -stable, thanks.
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