Messages in this thread Patch in this message | | | From | Sasha Levin <> | Subject | [PATCH AUTOSEL 4.14 38/44] libata: add SG safety checks in SFF pio transfers | Date | Tue, 13 Aug 2019 22:18:27 -0400 |
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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 cc2f2e35f4c2e..8c36ff0c2dd49 100644 --- a/drivers/ata/libata-sff.c +++ b/drivers/ata/libata-sff.c @@ -704,6 +704,10 @@ 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; @@ -729,6 +733,8 @@ 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
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