libata: add SG safety checks in SFF pio transfers
[ 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>
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1 changed files with 6 additions and 0 deletions
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@ -703,6 +703,10 @@ static void ata_pio_sector(struct ata_queued_cmd *qc)
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unsigned int offset;
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unsigned char *buf;
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if (!qc->cursg) {
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qc->curbytes = qc->nbytes;
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return;
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}
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if (qc->curbytes == qc->nbytes - qc->sect_size)
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ap->hsm_task_state = HSM_ST_LAST;
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@ -742,6 +746,8 @@ static void ata_pio_sector(struct ata_queued_cmd *qc)
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if (qc->cursg_ofs == qc->cursg->length) {
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qc->cursg = sg_next(qc->cursg);
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if (!qc->cursg)
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ap->hsm_task_state = HSM_ST_LAST;
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qc->cursg_ofs = 0;
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}
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}
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