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 0C69B198845; Wed, 5 Feb 2025 14:55:06 +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=1738767306; cv=none; b=AJ9iFmtFwYHAzYJgiBfZflAMnieYfDx+9iPqwrdrHvWoS2429GXPGXCeApIKfEpQUvZd5qBPOZY72gpRQjjHosHaXXpfV1BfMI5ekoxg3HIpa1/0kH58RACJH4p/c/HbSPzxx6aqQabgS3gztZsf2j2SYNQn35q6u4SuaJVDVo8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738767306; c=relaxed/simple; bh=YLZOeYxpyOK+bIUZVcLOM5PK7zqnv2nz13cVATviMgI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=sJZE6LHX32lGMB9aTHIapsYYf68fYOYfwOYL9D1CQZgdxkgpxvZvtThU9xSARcZmhqG07aJ7OCyLIiHW2IagnSOGt5ikhisvL3FcRuhhuaaEZ26O/kYzWQXoCpNl4lQUYwbQqNMEU4V/Q/lrzkvIFy9jpOH6adXRcYihVK0KMpw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=zRl/dTmk; 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="zRl/dTmk" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6C0F2C4CED1; Wed, 5 Feb 2025 14:55:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1738767305; bh=YLZOeYxpyOK+bIUZVcLOM5PK7zqnv2nz13cVATviMgI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=zRl/dTmkMs8aFbQvbtbI5T0EOext1dw93QHpfTZgdDwHkM4komitEAyog9daYE83k xk3eTlwkGLM2HgS3poHeZ97k1hISOWNMf0Op3Kk++wpazgUABh1f72OxfaGYYwLPrh /+seiVXu/moqMQM9wj67MAItpO/hcSSGNpTmz15k= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Guixin Liu , Bart Van Assche , "Martin K. Petersen" , Sasha Levin Subject: [PATCH 6.12 437/590] scsi: mpi3mr: Fix possible crash when setting up bsg fails Date: Wed, 5 Feb 2025 14:43:12 +0100 Message-ID: <20250205134511.986299556@linuxfoundation.org> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250205134455.220373560@linuxfoundation.org> References: <20250205134455.220373560@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Guixin Liu [ Upstream commit 295006f6e8c17212d3098811166e29627d19e05c ] If bsg_setup_queue() fails, the bsg_queue is assigned a non-NULL value. Consequently, in mpi3mr_bsg_exit(), the condition "if(!mrioc->bsg_queue)" will not be satisfied, preventing execution from entering bsg_remove_queue(), which could lead to the following crash: BUG: kernel NULL pointer dereference, address: 000000000000041c Call Trace: mpi3mr_bsg_exit+0x1f/0x50 [mpi3mr] mpi3mr_remove+0x6f/0x340 [mpi3mr] pci_device_remove+0x3f/0xb0 device_release_driver_internal+0x19d/0x220 unbind_store+0xa4/0xb0 kernfs_fop_write_iter+0x11f/0x200 vfs_write+0x1fc/0x3e0 ksys_write+0x67/0xe0 do_syscall_64+0x38/0x80 entry_SYSCALL_64_after_hwframe+0x78/0xe2 Fixes: 4268fa751365 ("scsi: mpi3mr: Add bsg device support") Signed-off-by: Guixin Liu Link: https://lore.kernel.org/r/20250107022032.24006-1-kanie@linux.alibaba.com Reviewed-by: Bart Van Assche Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin --- drivers/scsi/mpi3mr/mpi3mr_app.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/scsi/mpi3mr/mpi3mr_app.c b/drivers/scsi/mpi3mr/mpi3mr_app.c index 10b8e4dc64f8b..7589f48aebc80 100644 --- a/drivers/scsi/mpi3mr/mpi3mr_app.c +++ b/drivers/scsi/mpi3mr/mpi3mr_app.c @@ -2951,6 +2951,7 @@ void mpi3mr_bsg_init(struct mpi3mr_ioc *mrioc) .max_hw_sectors = MPI3MR_MAX_APP_XFER_SECTORS, .max_segments = MPI3MR_MAX_APP_XFER_SEGMENTS, }; + struct request_queue *q; device_initialize(bsg_dev); @@ -2966,14 +2967,17 @@ void mpi3mr_bsg_init(struct mpi3mr_ioc *mrioc) return; } - mrioc->bsg_queue = bsg_setup_queue(bsg_dev, dev_name(bsg_dev), &lim, + q = bsg_setup_queue(bsg_dev, dev_name(bsg_dev), &lim, mpi3mr_bsg_request, NULL, 0); - if (IS_ERR(mrioc->bsg_queue)) { + if (IS_ERR(q)) { ioc_err(mrioc, "%s: bsg registration failed\n", dev_name(bsg_dev)); device_del(bsg_dev); put_device(bsg_dev); + return; } + + mrioc->bsg_queue = q; } /** -- 2.39.5