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[2620:137:e000::1:20]) by mx.google.com with ESMTP id h3-20020a056a00218300b0056ee105315fsi18386860pfi.178.2022.12.28.11.45.36; Wed, 28 Dec 2022 11:45:52 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@google.com header.s=20210112 header.b=ZmaFVF7j; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230080AbiL1Tm6 (ORCPT + 99 others); Wed, 28 Dec 2022 14:42:58 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49974 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230078AbiL1Tm4 (ORCPT ); Wed, 28 Dec 2022 14:42:56 -0500 Received: from mail-yw1-x1149.google.com (mail-yw1-x1149.google.com [IPv6:2607:f8b0:4864:20::1149]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2A42B1165 for ; Wed, 28 Dec 2022 11:42:55 -0800 (PST) Received: by mail-yw1-x1149.google.com with SMTP id 00721157ae682-434eb7c6fa5so184197287b3.14 for ; Wed, 28 Dec 2022 11:42:55 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=h66ZlJIW0sPnpY7cABzav3ob2j9zOJpX5LkgC0xA0/8=; b=ZmaFVF7jonGinSfOfqJLrvexRkxJcgPqsnKMM2BWGIh/BVHh7PqXo08JdBFt3JvzDT MtFcfUdyqDiaFCLySq0/hKOSrDV1GcyYBXtmNsEtbbs0AD5T4KILU972sTh9LBVzvylG tQ34yld8u16qX7XcANjKxhlHCij158UtIOUP/9gRAC7H35s/1sJXhDZT3sMLn3/tZhV7 aWcN73j9+nlL33mr6ie5dvAYJUjVKshl6AviGRMeNglXhoCBBVDSmhZzyQClFEryL6aG E8UwArx1nYdxTy3CYrwtb/ObqUZ8XeDEoelJ/4aWBtjKXZWtTcThztS84KOf7idyfQVd fSSQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=h66ZlJIW0sPnpY7cABzav3ob2j9zOJpX5LkgC0xA0/8=; b=xtKEwWUPNOyz6qLjjpyBrSjcA3HO/XRIIxg4LpG7cPwhjIOhS/Ms2Rn+7k96fNOc59 IF2KbbR/KQt6Kv+VqcM8AaJC0CT2kaVIpiYFRF0iuVegZkM8WYS8ldXCt8tV1Ldj7TZC u8G7FCDezZ1IfNh4J8nGCpUCxsMd5jcV5pBovea3WKMLcZAta7QNh64kdcK650+UbBL/ E3AC1Nymor7/vbkJmYvyzL/+MQfQxUoL431vQl3Umm//873ttMm5TTdSjAwveBtyjl+X Hj6UM4SILeRA5/JaPLnk32COUl7S/bq6xRUJsrpS/3uEWcWboHXyNbMRd2wQjLZRD5Z3 G6mA== X-Gm-Message-State: AFqh2kr/VIjlOYycfaLeFiMslH9p7b8cbitRM62l3tpmAcPie7HN9nwI QfAxUM3J9rM2P4H+JXvFsmSibsiwd1A= X-Received: from surenb-desktop.mtv.corp.google.com ([2620:15c:211:200:77b8:ecbc:954d:4461]) (user=surenb job=sendgmr) by 2002:a25:d496:0:b0:70c:4fa3:2cce with SMTP id m144-20020a25d496000000b0070c4fa32ccemr3787363ybf.539.1672256574382; Wed, 28 Dec 2022 11:42:54 -0800 (PST) Date: Wed, 28 Dec 2022 11:42:49 -0800 Mime-Version: 1.0 X-Mailer: git-send-email 2.39.0.314.g84b9a713c41-goog Message-ID: <20221228194249.170354-1-surenb@google.com> Subject: [PATCH 1/1] mm: fix vma->anon_name memory leak for anonymous shmem VMAs From: Suren Baghdasaryan To: akpm@linux-foundation.org Cc: hughd@google.com, hannes@cmpxchg.org, david@redhat.com, vincent.whitchurch@axis.com, seanjc@google.com, rppt@kernel.org, shy828301@gmail.com, pasha.tatashin@soleen.com, paul.gortmaker@windriver.com, peterx@redhat.com, vbabka@suse.cz, Liam.Howlett@Oracle.com, ccross@google.com, willy@infradead.org, arnd@arndb.de, cgel.zte@gmail.com, yuzhao@google.com, bagasdotme@gmail.com, suleiman@google.com, steven@liquorix.net, heftig@archlinux.org, cuigaosheng1@huawei.com, kirill@shutemov.name, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, surenb@google.com, syzbot+91edf9178386a07d06a7@syzkaller.appspotmail.com X-Spam-Status: No, score=-9.6 required=5.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_PASS,USER_IN_DEF_DKIM_WL autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1753488296316395951?= X-GMAIL-MSGID: =?utf-8?q?1753488296316395951?= free_anon_vma_name() is missing a check for anonymous shmem VMA which leads to a memory leak due to refcount not being dropped. Fix this by adding the missing check. Fixes: d09e8ca6cb93 ("mm: anonymous shared memory naming") Reported-by: syzbot+91edf9178386a07d06a7@syzkaller.appspotmail.com Signed-off-by: Suren Baghdasaryan Acked-by: David Hildenbrand --- include/linux/mm_inline.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/linux/mm_inline.h b/include/linux/mm_inline.h index e8ed225d8f7c..d650ca2c5d29 100644 --- a/include/linux/mm_inline.h +++ b/include/linux/mm_inline.h @@ -413,7 +413,7 @@ static inline void free_anon_vma_name(struct vm_area_struct *vma) * Not using anon_vma_name because it generates a warning if mmap_lock * is not held, which might be the case here. */ - if (!vma->vm_file) + if (!vma->vm_file || vma_is_anon_shmem(vma)) anon_vma_name_put(vma->anon_name); }