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authorAlexander.Barabash@dell.com <Alexander.Barabash@dell.com>2019-12-25 17:55:30 +0000
committerVinod Koul <vkoul@kernel.org>2019-12-27 12:06:06 +0530
commitb0b5ce1010ffc50015eaec72b0028aaae3f526bb (patch)
tree9ee0b88bc93b8dd777a2c2d95b95863a164bf5b9 /drivers/dma/ioat
parent24461d9792c2c706092805ff1b067628933441bd (diff)
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.c3
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;