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 BDE5C1D0E06; Wed, 2 Oct 2024 14:29:12 +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=1727879352; cv=none; b=PcfPrtyL2NyrghyW/lH/lXnk6LKPL6H2JW6TApDCMmPYIg4Rrcm1LdNodksqZlL1XWT1/FGWPPNtJZSMbEP1wVOmUiYg1tIbCNz3t/g2d6leeXezjLU+ks83x8nUliux+oTfKqYt407YAHa6pJOhTEzS1xKSCJ+9fil4PvQ9uNU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727879352; c=relaxed/simple; bh=lcgmMQjj9+gMJcdXvhPLrshe7nPfHuVzCHwfpdtWJDg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=m5qT0L4BGP92YWAzrAjQlbysiRITDvEUK3a9uLJ3sqEJD2LvFaGlEejd1IgmH0vP9uBLcnxVsbQyFHzrp6JyVlk+6k+FTc96isKhkZ2D/HKn2OoC93aRnYsZCi22UNClxP3QFsYalKnMor4jp9aiqZy+oKoZ6fVGCF9xj3u8Hsc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=SXIBmXwu; 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="SXIBmXwu" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 49AD8C4CEC2; Wed, 2 Oct 2024 14:29:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1727879352; bh=lcgmMQjj9+gMJcdXvhPLrshe7nPfHuVzCHwfpdtWJDg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=SXIBmXwukhW3M9a7E9Dp4W9AOrwg/VKXTFFDh2EWc9wVd81lNhnhPK9wHElsPfHTp SDfLyZxC8Wbcgf+U4jkT1Ex4KlOL7sBPc3CsVU62mI2g18+JXh0NHM8tmCbjNar4tU 3ylZ4vcyXrC5TqDeGRzuIz/E28IunM0cfwPCFqxc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Riyan Dhiman , Christoph Hellwig , Jens Axboe , Sasha Levin Subject: [PATCH 6.6 088/538] block: fix potential invalid pointer dereference in blk_add_partition Date: Wed, 2 Oct 2024 14:55:27 +0200 Message-ID: <20241002125755.698162032@linuxfoundation.org> X-Mailer: git-send-email 2.46.2 In-Reply-To: <20241002125751.964700919@linuxfoundation.org> References: <20241002125751.964700919@linuxfoundation.org> User-Agent: quilt/0.67 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 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Riyan Dhiman [ Upstream commit 26e197b7f9240a4ac301dd0ad520c0c697c2ea7d ] The blk_add_partition() function initially used a single if-condition (IS_ERR(part)) to check for errors when adding a partition. This was modified to handle the specific case of -ENXIO separately, allowing the function to proceed without logging the error in this case. However, this change unintentionally left a path where md_autodetect_dev() could be called without confirming that part is a valid pointer. This commit separates the error handling logic by splitting the initial if-condition, improving code readability and handling specific error scenarios explicitly. The function now distinguishes the general error case from -ENXIO without altering the existing behavior of md_autodetect_dev() calls. Fixes: b72053072c0b (block: allow partitions on host aware zone devices) Signed-off-by: Riyan Dhiman Reviewed-by: Christoph Hellwig Link: https://lore.kernel.org/r/20240911132954.5874-1-riyandhiman14@gmail.com Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin --- block/partitions/core.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/block/partitions/core.c b/block/partitions/core.c index 6b2ef9977617a..fc0ab5d8ab705 100644 --- a/block/partitions/core.c +++ b/block/partitions/core.c @@ -574,9 +574,11 @@ static bool blk_add_partition(struct gendisk *disk, part = add_partition(disk, p, from, size, state->parts[p].flags, &state->parts[p].info); - if (IS_ERR(part) && PTR_ERR(part) != -ENXIO) { - printk(KERN_ERR " %s: p%d could not be added: %pe\n", - disk->disk_name, p, part); + if (IS_ERR(part)) { + if (PTR_ERR(part) != -ENXIO) { + printk(KERN_ERR " %s: p%d could not be added: %pe\n", + disk->disk_name, p, part); + } return true; } -- 2.43.0