From: "Alexander.Barabash@dell.com" Alexander.Barabash@dell.com
[ 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 alexander.barabash@dell.com Acked-by: Dave Jiang dave.jiang@intel.com Link: https://lore.kernel.org/r/75e9c0e84c3345d693c606c64f8b9ab5@x13pwhopdag1307.A... Signed-off-by: Vinod Koul vkoul@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/dma/ioat/dma.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
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;