Stable Archive on lore.kernel.org
 help / color / Atom feed
From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Jens Axboe <axboe@kernel.dk>, Kees Cook <keescook@chromium.org>,
	Sasha Levin <sashal@kernel.org>,
	linux-ide@vger.kernel.org
Subject: [PATCH AUTOSEL 4.4 27/28] libata: add SG safety checks in SFF pio transfers
Date: Tue, 13 Aug 2019 22:25:49 -0400
Message-ID: <20190814022550.17463-27-sashal@kernel.org> (raw)
In-Reply-To: <20190814022550.17463-1-sashal@kernel.org>

From: Jens Axboe <axboe@kernel.dk>

[ Upstream commit 752ead44491e8c91e14d7079625c5916b30921c5 ]

Abort processing of a command if we run out of mapped data in the
SG list. This should never happen, but a previous bug caused it to
be possible. Play it safe and attempt to abort nicely if we don't
have more SG segments left.

Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/ata/libata-sff.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c
index 18de4c4570682..1d8901fc0bfa9 100644
--- a/drivers/ata/libata-sff.c
+++ b/drivers/ata/libata-sff.c
@@ -703,6 +703,10 @@ static void ata_pio_sector(struct ata_queued_cmd *qc)
 	unsigned int offset;
 	unsigned char *buf;
 
+	if (!qc->cursg) {
+		qc->curbytes = qc->nbytes;
+		return;
+	}
 	if (qc->curbytes == qc->nbytes - qc->sect_size)
 		ap->hsm_task_state = HSM_ST_LAST;
 
@@ -742,6 +746,8 @@ static void ata_pio_sector(struct ata_queued_cmd *qc)
 
 	if (qc->cursg_ofs == qc->cursg->length) {
 		qc->cursg = sg_next(qc->cursg);
+		if (!qc->cursg)
+			ap->hsm_task_state = HSM_ST_LAST;
 		qc->cursg_ofs = 0;
 	}
 }
-- 
2.20.1


  parent reply index

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-14  2:25 [PATCH AUTOSEL 4.4 01/28] HID: Add 044f:b320 ThrustMaster, Inc. 2 in 1 DT Sasha Levin
2019-08-14  2:25 ` [PATCH AUTOSEL 4.4 02/28] MIPS: kernel: only use i8253 clocksource with periodic clockevent Sasha Levin
2019-08-14  2:25 ` [PATCH AUTOSEL 4.4 03/28] netfilter: ebtables: fix a memory leak bug in compat Sasha Levin
2019-08-14  2:25 ` [PATCH AUTOSEL 4.4 04/28] bonding: Force slave speed check after link state recovery for 802.3ad Sasha Levin
2019-08-14  2:25 ` [PATCH AUTOSEL 4.4 05/28] can: dev: call netif_carrier_off() in register_candev() Sasha Levin
2019-08-14  2:25 ` [PATCH AUTOSEL 4.4 06/28] ASoC: Fail card instantiation if DAI format setup fails Sasha Levin
2019-08-14  2:25 ` [PATCH AUTOSEL 4.4 07/28] st21nfca_connectivity_event_received: null check the allocation Sasha Levin
2019-08-14  2:25 ` [PATCH AUTOSEL 4.4 08/28] st_nci_hci_connectivity_event_received: " Sasha Levin
2019-08-14  2:25 ` [PATCH AUTOSEL 4.4 09/28] ASoC: ti: davinci-mcasp: Correct slot_width posed constraint Sasha Levin
2019-08-14  2:25 ` [PATCH AUTOSEL 4.4 10/28] net: usb: qmi_wwan: Add the BroadMobi BM818 card Sasha Levin
2019-08-14  2:25 ` [PATCH AUTOSEL 4.4 11/28] isdn: mISDN: hfcsusb: Fix possible null-pointer dereferences in start_isoc_chain() Sasha Levin
2019-08-14  2:25 ` [PATCH AUTOSEL 4.4 12/28] isdn: hfcsusb: Fix mISDN driver crash caused by transfer buffer on the stack Sasha Levin
2019-08-14  2:25 ` [PATCH AUTOSEL 4.4 13/28] perf bench numa: Fix cpu0 binding Sasha Levin
2019-08-14  2:25 ` [PATCH AUTOSEL 4.4 14/28] Input: kbtab - sanity check for endpoint type Sasha Levin
2019-08-14  2:25 ` [PATCH AUTOSEL 4.4 15/28] net: usb: pegasus: fix improper read if get_registers() fail Sasha Levin
2019-08-14  2:25 ` [PATCH AUTOSEL 4.4 16/28] can: sja1000: force the string buffer NULL-terminated Sasha Levin
2019-08-14  2:25 ` [PATCH AUTOSEL 4.4 17/28] can: peak_usb: " Sasha Levin
2019-08-14  2:25 ` [PATCH AUTOSEL 4.4 18/28] NFSv4: Fix a potential sleep while atomic in nfs4_do_reclaim() Sasha Levin
2019-08-14  2:25 ` [PATCH AUTOSEL 4.4 19/28] HID: holtek: test for sanity of intfdata Sasha Levin
2019-08-14  2:25 ` [PATCH AUTOSEL 4.4 20/28] HID: hiddev: avoid opening a disconnected device Sasha Levin
2019-08-14  2:25 ` [PATCH AUTOSEL 4.4 21/28] HID: hiddev: do cleanup in failure of opening a device Sasha Levin
2019-08-14  2:25 ` [PATCH AUTOSEL 4.4 22/28] Input: iforce - add sanity checks Sasha Levin
2019-08-14  2:25 ` [PATCH AUTOSEL 4.4 23/28] net: cxgb3_main: Fix a resource leak in a error path in 'init_one()' Sasha Levin
2019-08-14  2:25 ` [PATCH AUTOSEL 4.4 24/28] net: hisilicon: make hip04_tx_reclaim non-reentrant Sasha Levin
2019-08-14  2:25 ` [PATCH AUTOSEL 4.4 25/28] net: hisilicon: fix hip04-xmit never return TX_BUSY Sasha Levin
2019-08-14  2:25 ` [PATCH AUTOSEL 4.4 26/28] net: hisilicon: Fix dma_map_single failed on arm64 Sasha Levin
2019-08-14  2:25 ` Sasha Levin [this message]
2019-08-14  2:25 ` [PATCH AUTOSEL 4.4 28/28] selftests: kvm: Adding config fragments Sasha Levin

Reply instructions:

You may reply publically to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20190814022550.17463-27-sashal@kernel.org \
    --to=sashal@kernel.org \
    --cc=axboe@kernel.dk \
    --cc=keescook@chromium.org \
    --cc=linux-ide@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=stable@vger.kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Stable Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/stable/0 stable/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 stable stable/ https://lore.kernel.org/stable \
		stable@vger.kernel.org stable@archiver.kernel.org
	public-inbox-index stable


Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.stable


AGPL code for this site: git clone https://public-inbox.org/ public-inbox