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 5.2 112/123] libata: add SG safety checks in SFF pio transfers
Date: Tue, 13 Aug 2019 22:10:36 -0400 [thread overview]
Message-ID: <20190814021047.14828-112-sashal@kernel.org> (raw)
In-Reply-To: <20190814021047.14828-1-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 10aa278821427..4f115adb4ee83 100644
--- a/drivers/ata/libata-sff.c
+++ b/drivers/ata/libata-sff.c
@@ -658,6 +658,10 @@ 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;
@@ -683,6 +687,8 @@ 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
prev parent reply other threads:[~2019-08-14 2:15 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20190814021047.14828-1-sashal@kernel.org>
2019-08-14 2:10 ` [PATCH AUTOSEL 5.2 100/123] ata: rb532_cf: Fix unused variable warning in rb532_pata_driver_probe Sasha Levin
2019-08-14 2:10 ` [PATCH AUTOSEL 5.2 111/123] libata: have ata_scsi_rw_xlat() fail invalid passthrough requests Sasha Levin
2019-08-14 2:10 ` Sasha Levin [this message]
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