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Thu, 18 Jun 2020 16:21:59 +0000 (UTC) X-HE-Tag: scale72_42164a326e11 X-Filterd-Recvd-Size: 3844 Received: from hqnvemgate24.nvidia.com (hqnvemgate24.nvidia.com [216.228.121.143]) by imf11.hostedemail.com (Postfix) with ESMTP for ; Thu, 18 Jun 2020 16:21:59 +0000 (UTC) Received: from hqpgpgate101.nvidia.com (Not Verified[216.228.121.13]) by hqnvemgate24.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Thu, 18 Jun 2020 09:20:17 -0700 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate101.nvidia.com (PGP Universal service); Thu, 18 Jun 2020 09:21:57 -0700 X-PGP-Universal: processed; by hqpgpgate101.nvidia.com on Thu, 18 Jun 2020 09:21:57 -0700 Received: from rcampbell-dev.nvidia.com (10.124.1.5) by HQMAIL107.nvidia.com (172.20.187.13) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Thu, 18 Jun 2020 16:21:57 +0000 Subject: Re: [PATCH -next] lib: fix test_hmm.c reference after free To: Randy Dunlap , LKML , Andrew Morton , Linux MM CC: =?UTF-8?B?SsOpcsO0bWUgR2xpc3Nl?= References: X-Nvconfidentiality: public From: Ralph Campbell Message-ID: Date: Thu, 18 Jun 2020 09:21:57 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.2.2 MIME-Version: 1.0 In-Reply-To: X-Originating-IP: [10.124.1.5] X-ClientProxiedBy: HQMAIL101.nvidia.com (172.20.187.10) To HQMAIL107.nvidia.com (172.20.187.13) Content-Type: text/plain; charset="utf-8"; format=flowed Content-Language: en-US Content-Transfer-Encoding: quoted-printable DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1592497217; bh=0hMi0xIwkUC9/TCs8lWLufXqXDXyWYEohg3QmmYj+og=; h=X-PGP-Universal:Subject:To:CC:References:X-Nvconfidentiality:From: Message-ID:Date:User-Agent:MIME-Version:In-Reply-To: X-Originating-IP:X-ClientProxiedBy:Content-Type:Content-Language: Content-Transfer-Encoding; b=BhqrUg2yERdAPawT5Qw+t1rBqdhQpLqbOV17quzsC/9rjv6aMSq/08gIKFAIfnzC8 fLNVgJUxCYmt4ODHApjKeW8X41saLfBstZnr4Mrt4ew6jwqzwgaN+FrEX5vZU0f+uv ytpvt9Al4dInIlHv1IrCulb0wIIf8W43P5VnQDmijbE5NBUfUi4pX+jx4V//Jqzs7y LGrHBOEfbwED/NLPnPRG4aBFm8CdNTDEp6VJ+/7FV+k7wYEj4a4KG+Ct+5I0nejD8N xl3wDHJIDbbszYz4XG3tQ+uYRCN98O8xMG3f23aTRMb/uWKphvTYTYNCuv7EHEikVx A+Ogz+qbUsoNA== X-Rspamd-Queue-Id: DF31D180B753E X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam04 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 6/17/20 10:31 PM, Randy Dunlap wrote: > From: Randy Dunlap >=20 > Coccinelle scripts report the following errors: >=20 > lib/test_hmm.c:523:20-26: ERROR: reference preceded by free on line 521 > lib/test_hmm.c:524:21-27: ERROR: reference preceded by free on line 521 > lib/test_hmm.c:523:28-35: ERROR: devmem is NULL but dereferenced. > lib/test_hmm.c:524:29-36: ERROR: devmem is NULL but dereferenced. >=20 > Fix these by using the local variable 'res' instead of devmem. >=20 > Signed-off-by: Randy Dunlap > Cc: J=C3=A9r=C3=B4me Glisse > Cc: linux-mm@kvack.org > Cc: Ralph Campbell > --- > lib/test_hmm.c | 3 +-- > 1 file changed, 1 insertion(+), 2 deletions(-) >=20 > --- linux-next-20200617.orig/lib/test_hmm.c > +++ linux-next-20200617/lib/test_hmm.c > @@ -520,8 +520,7 @@ static bool dmirror_allocate_chunk(struc > err_free: > kfree(devmem); > err_release: > - release_mem_region(devmem->pagemap.res.start, > - resource_size(&devmem->pagemap.res)); > + release_mem_region(res->start, resource_size(res)); > err: > mutex_unlock(&mdevice->devmem_lock); > return false; >=20 Thanks for fixing this! Reviewed-by: Ralph Campbell