From: Andrey Vatoropin <a.vatoropin@xxxxxxx>
The function ib_umem_find_best_pgsz may return a value of zero.
If this occurs, the function ib_umem_num_dma_blocks could attempt
to divide by zero, resulting in a division by zero error.
To avoid this, please add a check to ensure that the variable
is not zero before performing the division.
Found by Linux Verification Center (linuxtesting.org) with SVACE.
Fixes: 6d1782919dc9 ("drm/cma: Introduce drm_gem_cma_dumb_create_internal()")
Signed-off-by: Andrey Vatoropin <a.vatoropin@xxxxxxx>
---
drivers/infiniband/hw/erdma/erdma_verbs.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/infiniband/hw/erdma/erdma_verbs.c b/drivers/infiniband/hw/erdma/erdma_verbs.c
index 51d619edb6c5..7ad38fb84661 100644
--- a/drivers/infiniband/hw/erdma/erdma_verbs.c
+++ b/drivers/infiniband/hw/erdma/erdma_verbs.c
@@ -781,6 +781,10 @@ static int get_mtt_entries(struct erdma_dev *dev, struct erdma_mem *mem,
mem->page_size = ib_umem_find_best_pgsz(mem->umem, req_page_size, virt);
+ if (!mem->page_size) {
+ ret = -EINVAL;
+ goto error_ret;
+ }
mem->page_offset = start & (mem->page_size - 1);
mem->mtt_nents = ib_umem_num_dma_blocks(mem->umem, mem->page_size);
mem->page_cnt = mem->mtt_nents;
mem->mtt = erdma_create_mtt(dev, MTT_SIZE(mem->page_cnt),
force_continuous);
--
2.43.0
