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| author | Alexander.Barabash@dell.com <Alexander.Barabash@dell.com> | 2019-12-25 17:55:30 +0000 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2019-12-27 12:06:06 +0530 |
| commit | b0b5ce1010ffc50015eaec72b0028aaae3f526bb (patch) | |
| tree | 9ee0b88bc93b8dd777a2c2d95b95863a164bf5b9 /drivers/dma/ioat | |
| parent | 24461d9792c2c706092805ff1b067628933441bd (diff) | |
| download | lwn-b0b5ce1010ffc50015eaec72b0028aaae3f526bb.tar.gz lwn-b0b5ce1010ffc50015eaec72b0028aaae3f526bb.zip | |
ioat: ioat_alloc_ring() failure handling.
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 <alexander.barabash@dell.com>
Acked-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/75e9c0e84c3345d693c606c64f8b9ab5@x13pwhopdag1307.AMER.DELL.COM
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/dma/ioat')
| -rw-r--r-- | drivers/dma/ioat/dma.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c index 1a422a8b43cf..18c011e57592 100644 --- a/drivers/dma/ioat/dma.c +++ b/drivers/dma/ioat/dma.c @@ -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; |