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nvme: Fix discard buffer overrun

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This patch checks the discard range array bounds before setting it in
case the driver gets a badly formed request.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
This commit is contained in:
Keith Busch 2018-01-31 17:01:58 -07:00 committed by Sagi Grimberg
parent 3096a739d2
commit 8cb6af7b3a
1 changed files with 5 additions and 3 deletions
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8
drivers/nvme/host/core.c
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@ -518,9 +518,11 @@ static blk_status_t nvme_setup_discard(struct nvme_ns *ns, struct request *req,
u64 slba = nvme_block_nr(ns, bio->bi_iter.bi_sector);
u32 nlb = bio->bi_iter.bi_size >> ns->lba_shift;
range[n].cattr = cpu_to_le32(0);
range[n].nlb = cpu_to_le32(nlb);
range[n].slba = cpu_to_le64(slba);
if (n < segments) {
range[n].cattr = cpu_to_le32(0);
range[n].nlb = cpu_to_le32(nlb);
range[n].slba = cpu_to_le64(slba);
}
n++;
}