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x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=microsoft.com header.result=pass header_is_org_domain=yes Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S966536AbeCSRNW (ORCPT ); Mon, 19 Mar 2018 13:13:22 -0400 Received: from mail-by2nam03on0106.outbound.protection.outlook.com ([104.47.42.106]:22396 "EHLO NAM03-BY2-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S933654AbeCSQKQ (ORCPT ); Mon, 19 Mar 2018 12:10:16 -0400 From: Sasha Levin To: "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" CC: Dmitry Monakhov , Jens Axboe , Sasha Levin Subject: [PATCH AUTOSEL for 4.4 120/167] bio-integrity: Do not allocate integrity context for bio w/o data Thread-Topic: [PATCH AUTOSEL for 4.4 120/167] bio-integrity: Do not allocate integrity context for bio w/o data Thread-Index: AQHTv5xvVv4PljaEE0O6Cd1zF0nU4A== Date: Mon, 19 Mar 2018 16:07:52 +0000 Message-ID: <20180319160513.16384-120-alexander.levin@microsoft.com> References: <20180319160513.16384-1-alexander.levin@microsoft.com> In-Reply-To: <20180319160513.16384-1-alexander.levin@microsoft.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [52.168.54.252] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;DM5PR2101MB0919;7:PE/fqFPB40IhDZ8/cg4/HHpzl3G4zubRnihdb4xG5TaJookdZkVX+TSZyM8a0oG1QrrE5967CPkRIoZUJl7QoD5FYHsR4pqOCd10HtOJDhjKX6YS2Snwicq3jVr0QLZyJUi5LZrN3DkkH7be9U8244MpfyaR3TnIHX/u4de3c65BA6aYJIsQW1dWmbHDKTGAWUto0jUANQaznp9yUYRN5sIGloUqk4FrPekXSGTsbMm9hdNPOspNbnU1GVac4atK;20:63zaNU8/OrNolTD1C/eG3zKL0Fq7k47+muMaT4X906M2BGatMtlmC3DXcPywu5oCcwOYrMyEdq3Akq3ae4DNJnCo3E2pvCF9+misY0pq21YVOoVIa2p7nv/ptJiP0seloWP9TDsS96F8BySqOtS6b4BVKOwKD47rL0yoAWWUr+4= x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: 9711a63b-6a0f-4107-9465-08d58db3dfae x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(48565401081)(5600026)(4604075)(3008032)(4534165)(4627221)(201703031133081)(201702281549075)(2017052603328)(7193020);SRVR:DM5PR2101MB0919; 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This patch prevent bugon like follows: kfree_debugcheck: out of range ptr ac1fa1d106742a5ah kernel BUG at mm/slab.c:2773! invalid opcode: 0000 [#1] SMP Modules linked in: bcache CPU: 0 PID: 4428 Comm: xfs_io Tainted: G W 4.11.0-rc4-ext4-000= 41-g2ef0043-dirty #43 Hardware name: Virtuozzo KVM, BIOS seabios-1.7.5-11.vz7.4 04/01/2014 task: ffff880137786440 task.stack: ffffc90000ba8000 RIP: 0010:kfree_debugcheck+0x25/0x2a RSP: 0018:ffffc90000babde0 EFLAGS: 00010082 RAX: 0000000000000034 RBX: ac1fa1d106742a5a RCX: 0000000000000007 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88013f3ccb40 RBP: ffffc90000babde8 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000fcb76420 R11: 00000000725172ed R12: 0000000000000282 R13: ffffffff8150e766 R14: ffff88013a145e00 R15: 0000000000000001 FS: 00007fb09384bf40(0000) GS:ffff88013f200000(0000) knlGS:000000000000000= 0 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd0172f9e40 CR3: 0000000137fa9000 CR4: 00000000000006f0 Call Trace: kfree+0xc8/0x1b3 bio_integrity_free+0xc3/0x16b bio_free+0x25/0x66 bio_put+0x14/0x26 blkdev_issue_flush+0x7a/0x85 blkdev_fsync+0x35/0x42 vfs_fsync_range+0x8e/0x9f vfs_fsync+0x1c/0x1e do_fsync+0x31/0x4a SyS_fsync+0x10/0x14 entry_SYSCALL_64_fastpath+0x1f/0xc2 Reviewed-by: Christoph Hellwig Reviewed-by: Hannes Reinecke Reviewed-by: Martin K. Petersen Signed-off-by: Dmitry Monakhov Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin --- block/bio-integrity.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/block/bio-integrity.c b/block/bio-integrity.c index f6325d573c10..6e091ccadcd4 100644 --- a/block/bio-integrity.c +++ b/block/bio-integrity.c @@ -175,6 +175,9 @@ bool bio_integrity_enabled(struct bio *bio) if (!bio_is_rw(bio)) return false; =20 + if (!bio_sectors(bio)) + return false; + /* Already protected? */ if (bio_integrity(bio)) return false; --=20 2.14.1