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ioat: ioat_alloc_ring() failure handling.

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[ Upstream commit b0b5ce1010ffc50015eaec72b0028aaae3f526bb ]

If dma_alloc_coherent() returns NULL in ioat_alloc_ring(), ring
allocation must not proceed.

Until now, if the first call to dma_alloc_coherent() in
ioat_alloc_ring() returned NULL, the processing could proceed, failing
with NULL-pointer dereferencing further down the line.

Signed-off-by: Alexander Barabash <[email protected]>
Acked-by: Dave Jiang <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Vinod Koul <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
This commit is contained in:
[email protected] 2019-12-25 17:55:30 +00:00 • committed by Greg Kroah-Hartman
commit 93ed80d6f1
1 changed files with 2 additions and 1 deletions
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3
drivers/dma/ioat/dma.c
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@ -377,10 +377,11 @@ ioat_alloc_ring(struct dma_chan *c, int order, gfp_t flags)
descs->virt = dma_alloc_coherent(to_dev(ioat_chan),
SZ_2M, &descs->hw, flags);
if (!descs->virt && (i > 0)) {
if (!descs->virt) {
int idx;
for (idx = 0; idx < i; idx++) {
descs = &ioat_chan->descs[idx];
dma_free_coherent(to_dev(ioat_chan), SZ_2M,
descs->virt, descs->hw);
descs->virt = NULL;