Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-28 15:11:31 +00:00
Code Issues Packages Projects Releases Wiki Activity

nvme-pci: fix out of bounds access in nvme_cqe_pending

Browse Source 
There is an out of bounds array access in nvme_cqe_peding().

When enable irq_thread for nvme interrupt, there is racing between the
nvmeq->cq_head updating and reading.

nvmeq->cq_head is updated in nvme_update_cq_head(), if nvmeq->cq_head
equals nvmeq->q_depth and before its value set to zero, nvme_cqe_pending()
uses its value as an array index, the index will be out of bounds.

Signed-off-by: Hongbo Yao <yaohongbo@huawei.com>
[hch: slight coding style update]
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Hongbo Yao 2019-01-07 10:22:07 +08:00 committed by Christoph Hellwig
parent 8fae268b40
commit dcca166272
1 changed files with 3 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/nvme/host/pci.c
View File

@ -1020,9 +1020,11 @@ static void nvme_complete_cqes(struct nvme_queue *nvmeq, u16 start, u16 end)
static inline void nvme_update_cq_head(struct nvme_queue *nvmeq)
{
if (++nvmeq->cq_head == nvmeq->q_depth) {
if (nvmeq->cq_head == nvmeq->q_depth - 1) {
nvmeq->cq_head = 0;
nvmeq->cq_phase = !nvmeq->cq_phase;
} else {
nvmeq->cq_head++;
}
}