From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8A90427147D for ; Wed, 1 Oct 2025 11:51:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759319499; cv=none; b=SG7wffjKPEwUKzhfXv3/jt0T5Ot4jJm5mID356kX4R6XGQ7pPQc/z2/4oAxZfMWUF23JgyQeU297AuAYxLaycm65idjZm7c73FNbP/4KkmQE+qencbeMEPjCtWS24sP4taBsMKbU6/d+/dLkN13Sw33P3nOvzGhRCRh6Pvpka+Q= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759319499; c=relaxed/simple; bh=+x74JK27MLw3MCLd1BlRwTC8JGgF879G+PoZCE9eeYo=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=j0yA2cvrAHovk00kYl8l87QoEBa+7FjT4RPeC+FMDhFK+IpjojhkG9XVAveCdP5GfIuaofEhLEKksJN0jEuUWN7V4NY7GpQ2Gafg5hVBgVaDLeWvOyuxbyCt7yLzLL3Gi5JG6Xd6Dz2jhsaPYcT2EiJU3fskefoQs4hWX8aClDs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=QOmTPk2i; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="QOmTPk2i" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A9CA6C4CEF4; Wed, 1 Oct 2025 11:51:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1759319499; bh=+x74JK27MLw3MCLd1BlRwTC8JGgF879G+PoZCE9eeYo=; h=From:To:Cc:Subject:Date:Reply-to:From; b=QOmTPk2i7bowSXT9Xl/ejQbAQfp0N3iirXLriiXs0yDqp/EuyPpgslqB4HRSQ9UL5 Thtw/60Kch2dNxYVOxfuNOY+kW9kB7N9/TiCV2dYSIn+uPNVS1GqTQGQhqiG3YQFtI FQAQTmoInPTkX0G6PKcTF3sKqdCRYBjAv0cn7yts= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2022-50434: blk-mq: fix possible memleak when register 'hctx' failed Date: Wed, 1 Oct 2025 13:42:07 +0200 Message-ID: <2025100159-CVE-2022-50434-e4db@gregkh> X-Mailer: git-send-email 2.51.0 Precedence: bulk X-Mailing-List: linux-cve-announce@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Reply-to: , X-Developer-Signature: v=1; a=openpgp-sha256; l=4132; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=bdLIKNbBWjFP/hLpn/NgHUior9p4CDFAmXK1uBnsP3M=; b=owGbwMvMwCRo6H6F97bub03G02pJDBl3hdtl//xcYqvx/2Sy1iHBV33J2o1Kj+NCdr78fOGIe eEevx3zOmJZGASZGGTFFFm+bOM5ur/ikKKXoe1pmDmsTCBDGLg4BWAiLvsY5pfceK5+t2FVc9i3 6LSkpcuctb0KnBjm56mwvObxkas5fOt91GvWNtk79pY6AA== X-Developer-Key: i=gregkh@linuxfoundation.org; a=openpgp; fpr=F4B60CC5BF78C2214A313DCB3147D40DDB2DFB29 Content-Transfer-Encoding: 8bit From: Greg Kroah-Hartman Description =========== In the Linux kernel, the following vulnerability has been resolved: blk-mq: fix possible memleak when register 'hctx' failed There's issue as follows when do fault injection test: unreferenced object 0xffff888132a9f400 (size 512): comm "insmod", pid 308021, jiffies 4324277909 (age 509.733s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 08 f4 a9 32 81 88 ff ff ...........2.... 08 f4 a9 32 81 88 ff ff 00 00 00 00 00 00 00 00 ...2............ backtrace: [<00000000e8952bb4>] kmalloc_node_trace+0x22/0xa0 [<00000000f9980e0f>] blk_mq_alloc_and_init_hctx+0x3f1/0x7e0 [<000000002e719efa>] blk_mq_realloc_hw_ctxs+0x1e6/0x230 [<000000004f1fda40>] blk_mq_init_allocated_queue+0x27e/0x910 [<00000000287123ec>] __blk_mq_alloc_disk+0x67/0xf0 [<00000000a2a34657>] 0xffffffffa2ad310f [<00000000b173f718>] 0xffffffffa2af824a [<0000000095a1dabb>] do_one_initcall+0x87/0x2a0 [<00000000f32fdf93>] do_init_module+0xdf/0x320 [<00000000cbe8541e>] load_module+0x3006/0x3390 [<0000000069ed1bdb>] __do_sys_finit_module+0x113/0x1b0 [<00000000a1a29ae8>] do_syscall_64+0x35/0x80 [<000000009cd878b0>] entry_SYSCALL_64_after_hwframe+0x46/0xb0 Fault injection context as follows: kobject_add blk_mq_register_hctx blk_mq_sysfs_register blk_register_queue device_add_disk null_add_dev.part.0 [null_blk] As 'blk_mq_register_hctx' may already add some objects when failed halfway, but there isn't do fallback, caller don't know which objects add failed. To solve above issue just do fallback when add objects failed halfway in 'blk_mq_register_hctx'. The Linux kernel CVE team has assigned CVE-2022-50434 to this issue. Affected and fixed versions =========================== Fixed in 4.9.337 with commit 654870789c3c1b9763316ef1c71d7a449127b175 Fixed in 4.14.303 with commit cb186eb47fb9dd327bdefa15f0c5fc55c53a40dd Fixed in 4.19.270 with commit 02bc8bc6eab03c84373281b85cb6e98747172ff7 Fixed in 5.4.229 with commit 87fd18016a47ea8ae12641377a390172c4aa97a7 Fixed in 5.10.163 with commit e8022da1fa2fdf2fa204b445dd3354e7a66d085a Fixed in 5.15.86 with commit eff45bfbc25a2509a6362dea6e699e14083c693c Fixed in 6.0.16 with commit 4b7fafa5f39b15c3a6ca3b95e534d05d6904cc95 Fixed in 6.1.2 with commit 33e8a3f61814ea30615d0fafaf50477975d6c1ca Fixed in 6.2 with commit 4b7a21c57b14fbcd0e1729150189e5933f5088e9 Please see https://www.kernel.org for a full list of currently supported kernel versions by the kernel community. Unaffected versions might change over time as fixes are backported to older supported kernel versions. The official CVE entry at https://cve.org/CVERecord/?id=CVE-2022-50434 will be updated if fixes are backported, please check that for the most up to date information about this issue. Affected files ============== The file(s) affected by this issue are: block/blk-mq-sysfs.c Mitigation ========== The Linux kernel CVE team recommends that you update to the latest stable kernel version for this, and many other bugfixes. Individual changes are never tested alone, but rather are part of a larger kernel release. Cherry-picking individual commits is not recommended or supported by the Linux kernel community at all. If however, updating to the latest release is impossible, the individual changes to resolve this issue can be found at these commits: https://git.kernel.org/stable/c/654870789c3c1b9763316ef1c71d7a449127b175 https://git.kernel.org/stable/c/cb186eb47fb9dd327bdefa15f0c5fc55c53a40dd https://git.kernel.org/stable/c/02bc8bc6eab03c84373281b85cb6e98747172ff7 https://git.kernel.org/stable/c/87fd18016a47ea8ae12641377a390172c4aa97a7 https://git.kernel.org/stable/c/e8022da1fa2fdf2fa204b445dd3354e7a66d085a https://git.kernel.org/stable/c/eff45bfbc25a2509a6362dea6e699e14083c693c https://git.kernel.org/stable/c/4b7fafa5f39b15c3a6ca3b95e534d05d6904cc95 https://git.kernel.org/stable/c/33e8a3f61814ea30615d0fafaf50477975d6c1ca https://git.kernel.org/stable/c/4b7a21c57b14fbcd0e1729150189e5933f5088e9