From patchwork Sat Jun 29 12:42:11 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Niklas Cassel X-Patchwork-Id: 13716915 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 2E6DD2574B; Sat, 29 Jun 2024 12:42:32 +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=1719664953; cv=none; b=kyrZvNKIldXMqVGawLhQ55I2oESZOH8LNpvytaz2srLkZYy0wblePTln//rJZSeoc3YR1DW5USRSCDFP58YsKY3/Kz8dG1yAYDS+tUpr4RoaJ8/2PRyImW41iaTo3SgKH6wDVT6ykdZdyVNwUGGDy13x3Gr8Ff4dk2yaQ8O3MS8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719664953; c=relaxed/simple; bh=Ghd/27ioPdGmjCXPDms5m/c98Lu6QS0GgtZMrPyqh2U=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=JAzH/PtvkFgv9iN+Oey2h10uhkUaLviY2bzSOQrBQzpEfx3OUyHBY7P/Y/hvBlDtstJ79dAKplBUT4hlJZmpa1W1TKYETGlVujFeVJGCUeOiWtIkG5Ac+wNQd8xHvNL50e4zrkcmsV11bkfZCSqeeoLWlj1+hh7tehUoK4nvLNg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=WDSScS9B; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="WDSScS9B" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 322C0C32789; Sat, 29 Jun 2024 12:42:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1719664952; bh=Ghd/27ioPdGmjCXPDms5m/c98Lu6QS0GgtZMrPyqh2U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=WDSScS9B4SQTGU7CHPWsbAeOpbWdQSeR7T+Z2/+SnxaV4eOPAMU8I9bogTQsVj+Bp br22NwiUul28tPJbdJq79KwykkaKdJiZXOYpOyo/shVQgs63icJJBLj6MY78DoCpEO EezUEy+CJ0gC76IxMC7QYyDW1O3C/4Q97u8nXYEz/3zZTaMkeL/rsXqelum/D02XSY dSRi6gTn3JtAZgUYYUFk129eHgszsbEZORcVK3QfAdwI+oGb34hz0ChI16GfJsv40p IbmqlCKhg8iO2L3jPFprFVD2g28D642CIItSW4/nNoak9HNwa3Z5P8Fjucrahxy7If vvp24KrXrDIPg== From: Niklas Cassel To: Damien Le Moal , Niklas Cassel , Tejun Heo , Jeff Garzik Cc: linux-scsi@vger.kernel.org, John Garry , Jason Yan , "Martin K. Petersen" , "James E.J. Bottomley" , stable@vger.kernel.org, Hannes Reinecke , linux-ide@vger.kernel.org Subject: [PATCH 1/4] ata: libata-core: Fix null pointer dereference on error Date: Sat, 29 Jun 2024 14:42:11 +0200 Message-ID: <20240629124210.181537-7-cassel@kernel.org> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240629124210.181537-6-cassel@kernel.org> References: <20240629124210.181537-6-cassel@kernel.org> Precedence: bulk X-Mailing-List: linux-scsi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2474; i=cassel@kernel.org; h=from:subject; bh=Ghd/27ioPdGmjCXPDms5m/c98Lu6QS0GgtZMrPyqh2U=; b=owGbwMvMwCV2MsVw8cxjvkWMp9WSGNIaGNUv7WD5IHLR78WWv4nPrTjUnszSl7RPF3H7HXAi6 39COPe3jlIWBjEuBlkxRRbfHy77i7vdpxxXvGMDM4eVCWQIAxenAExE5gDDHz65e8r741YsWy/0 /FxjYEemrsoP26/LmfXzF+48pdK3OYThr8DOKfMPXZs6fbNe37GbPrWnHS51Pj3oVyF754KRbJw 8Bw8A X-Developer-Key: i=cassel@kernel.org; a=openpgp; fpr=5ADE635C0E631CBBD5BE065A352FE6582ED9B5DA If the ata_port_alloc() call in ata_host_alloc() fails, ata_host_release() will get called. However, the code in ata_host_release() tries to free ata_port struct members unconditionally, which can lead to the following: BUG: unable to handle page fault for address: 0000000000003990 PGD 0 P4D 0 Oops: Oops: 0000 [#1] PREEMPT SMP NOPTI CPU: 10 PID: 594 Comm: (udev-worker) Not tainted 6.10.0-rc5 #44 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-2.fc40 04/01/2014 RIP: 0010:ata_host_release.cold+0x2f/0x6e [libata] Code: e4 4d 63 f4 44 89 e2 48 c7 c6 90 ad 32 c0 48 c7 c7 d0 70 33 c0 49 83 c6 0e 41 RSP: 0018:ffffc90000ebb968 EFLAGS: 00010246 RAX: 0000000000000041 RBX: ffff88810fb52e78 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffff88813b3218c0 RDI: ffff88813b3218c0 RBP: ffff88810fb52e40 R08: 0000000000000000 R09: 6c65725f74736f68 R10: ffffc90000ebb738 R11: 73692033203a746e R12: 0000000000000004 R13: 0000000000000000 R14: 0000000000000011 R15: 0000000000000006 FS: 00007f6cc55b9980(0000) GS:ffff88813b300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000003990 CR3: 00000001122a2000 CR4: 0000000000750ef0 PKRU: 55555554 Call Trace: ? __die_body.cold+0x19/0x27 ? page_fault_oops+0x15a/0x2f0 ? exc_page_fault+0x7e/0x180 ? asm_exc_page_fault+0x26/0x30 ? ata_host_release.cold+0x2f/0x6e [libata] ? ata_host_release.cold+0x2f/0x6e [libata] release_nodes+0x35/0xb0 devres_release_group+0x113/0x140 ata_host_alloc+0xed/0x120 [libata] ata_host_alloc_pinfo+0x14/0xa0 [libata] ahci_init_one+0x6c9/0xd20 [ahci] Do not access ata_port struct members unconditionally. Fixes: 633273a3ed1c ("libata-pmp: hook PMP support and enable it") Cc: stable@vger.kernel.org Reviewed-by: Damien Le Moal Reviewed-by: Hannes Reinecke Signed-off-by: Niklas Cassel Reviewed-by: John Garry --- drivers/ata/libata-core.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c index e1bf8a19b3c8..f47838da75d7 100644 --- a/drivers/ata/libata-core.c +++ b/drivers/ata/libata-core.c @@ -5518,6 +5518,9 @@ static void ata_host_release(struct kref *kref) for (i = 0; i < host->n_ports; i++) { struct ata_port *ap = host->ports[i]; + if (!ap) + continue; + kfree(ap->pmp_link); kfree(ap->slave_link); kfree(ap->ncq_sense_buf);