linux-kernel - Re: [PATCH][next] mm/zswap: fix potential uninitialized pointer read on tmp

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Date:   Thu, 28 Jan 2021 12:51:29 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Vlastimil Babka <vbabka@...e.cz>
Cc:     Colin King <colin.king@...onical.com>,
        Seth Jennings <sjenning@...hat.com>,
        Dan Streetman <ddstreet@...e.org>,
        Vitaly Wool <vitaly.wool@...sulko.com>,
        Tian Tao <tiantao6@...ilicon.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>, linux-mm@...ck.org,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] mm/zswap: fix potential uninitialized pointer
 read on tmp

On Thu, 28 Jan 2021 16:18:23 +0100 Vlastimil Babka <vbabka@...e.cz> wrote:

> On 1/28/21 3:17 PM, Colin King wrote:
> > From: Colin Ian King <colin.king@...onical.com>
> > 
> > In the case where zpool_can_sleep_mapped(pool) returns 0
> > then tmp is not allocated and tmp is then an uninitialized
> > pointer. Later if entry is null, tmp is freed, hence free'ing
> > an uninitialized pointer. Fix this by ensuring tmp is initialized
> > to NULL.
> > 
> > Addresses-Coverity: ("Uninitialized pointer read")
> > Fixes: 908aa806dba0 ("mm/zswap: fix potential memory leak")
> 
> That's a linux-next hash, patch is in mmotm [1] *) You know what it means...
> 
> *) actually it's not there, yet it is in -next. What's going on?
> 
> [1]
> https://ozlabs.org/~akpm/mmotm/broken-out/mm-zswap-fix-potential-memory-leak.patch

The containing file was renamed to
https://ozlabs.org/~akpm/mmotm/broken-out/mm-zswap-add-the-flag-can_sleep_mapped-fix-2.patch,
since it's a fix against mm-zswap-add-the-flag-can_sleep_mapped.patch.

And this patch's containing file will of course be
mm-zswap-add-the-flag-can_sleep_mapped-fix-3.patch.