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nvme: fix uninitialized prp2 value on small transfers

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The value of iod->first_dma ends up as prp2 in NVMe commands. In case
there is not enough data to cross a page boundary, iod->first_dma is
never initialized and contains random data.

Comply with the NVMe specification and fill in 0 in that case.

Signed-off-by: Jan H. Schönherr <jschoenh@amazon.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Jan H. Schönherr 2017-08-27 15:56:37 +02:00 committed by Sagi Grimberg
parent a7b7c7a105
commit 5228b3280b
1 changed files with 3 additions and 1 deletions
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4
drivers/nvme/host/pci.c
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@ -555,8 +555,10 @@ static blk_status_t nvme_setup_prps(struct nvme_dev *dev, struct request *req)
int nprps, i;
length -= (page_size - offset);
if (length <= 0)
if (length <= 0) {
iod->first_dma = 0;
return BLK_STS_OK;
}
dma_len -= (page_size - offset);
if (dma_len) {