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[54.240.9.92]) by mx.google.com with ESMTPS id q129si5080899qkb.189.2019.01.04.09.42.20 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Fri, 04 Jan 2019 09:42:20 -0800 (PST) Received-SPF: pass (google.com: domain of 0100016819f5682e-a7e2541c-4390-4e14-ac65-8793243215c6-000000@amazonses.com designates 54.240.9.92 as permitted sender) client-ip=54.240.9.92; Authentication-Results: mx.google.com; dkim=pass header.i=@amazonses.com header.s=ug7nbtf4gccmlpwj322ax3p6ow6yfsug header.b=b4H+x09L; spf=pass (google.com: domain of 0100016819f5682e-a7e2541c-4390-4e14-ac65-8793243215c6-000000@amazonses.com designates 54.240.9.92 as permitted sender) smtp.mailfrom=0100016819f5682e-a7e2541c-4390-4e14-ac65-8793243215c6-000000@amazonses.com DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/simple; s=ug7nbtf4gccmlpwj322ax3p6ow6yfsug; d=amazonses.com; t=1546623740; h=Date:From:To:cc:Subject:Message-ID:MIME-Version:Content-Type:Feedback-ID; bh=PL5ZHGs1jrB92OUdvNdjQudIiBDPP7SDTB3Z8/A1nH4=; b=b4H+x09L8r+R5BL0g2mLqQ9qIhWMP4+DQRcZRhTobaZSSEpaXXeBuxLnCH6IvroV Sfe8cd5J6kC1qrsHyKLqKTrRpT1FeC1AFPHNktDSdMMqTd1vQMiK9iFtLOuYxfVAIMM 66Bl9d6Nk1iaz1ZYYEYfAl/DYuRGMMj4cWoZ4soc= Date: Fri, 4 Jan 2019 17:42:20 +0000 From: Christopher Lameter X-X-Sender: cl@nuc-kabylake To: akpm@linuxfoundation.org cc: linux-mm@kvack.org, Dmitry Vyukov , stable@kernel.org, David Rientjes , Joonsoo Kim Subject: [FIX] slab: Alien caches must not be initialized if the allocation of the alien cache failed Message-ID: <0100016819f5682e-a7e2541c-4390-4e14-ac65-8793243215c6-000000@email.amazonses.com> User-Agent: Alpine 2.21 (DEB 202 2017-01-01) MIME-Version: 1.0 X-SES-Outgoing: 2019.01.04-54.240.9.92 Feedback-ID: 1.us-east-1.fQZZZ0Xtj2+TD7V5apTT/NrT6QKuPgzCT/IC7XYgDKI=:AmazonSES 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: X-Virus-Scanned: ClamAV using ClamSMTP From: Christoph Lameter Callers of __alloc_alien() check for NULL. We must do the same check in __alloc_alien() after the allocation of the alien cache to avoid potential NULL pointer dereferences should the allocation fail. Fixes: 49dfc304ba241b315068023962004542c5118103 ("slab: use the lock on alien_cache, instead of the lock on array_cache") Fixes: c8522a3a5832b843570a3315674f5a3575958a5 ("Slab: introduce alloc_alien") Signed-off-by: Christoph Lameter Reported-by: syzbot+d6ed4ec679652b4fd4e4@syzkaller.appspotmail.com Index: linux/mm/slab.c =================================================================== --- linux.orig/mm/slab.c +++ linux/mm/slab.c @@ -666,8 +666,10 @@ static struct alien_cache *__alloc_alien struct alien_cache *alc = NULL; alc = kmalloc_node(memsize, gfp, node); - init_arraycache(&alc->ac, entries, batch); - spin_lock_init(&alc->lock); + if (alc) { + init_arraycache(&alc->ac, entries, batch); + spin_lock_init(&alc->lock); + } return alc; }