Fix two issues with memory allocation in amdgpu_discovery_get_nps_info()
for mem_ranges:
- Add a check for allocation failure to avoid dereferencing a null
pointer.
- As suggested by Christophe, use kvcalloc() for memory allocation,
which checks for multiplication overflow.
Additionally, assign the output parameters nps_type and range_cnt after
the kvcalloc() call to prevent modifying the output parameters in case
of an error return.
Fixes: b194d21b9bcc ("drm/amdgpu: Use NPS ranges from discovery table")
Suggested-by: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
Reviewed-by: Lijo Lazar <lijo.lazar@xxxxxxx>
Signed-off-by: Li Huafei <lihuafei1@xxxxxxxxxx>
---
Changes in v3:
- As suggested by Christophe, replace kvzalloc() with kvcalloc()
- Link to v2: https://lore.kernel.org/lkml/20241029101839.2605713-1-lihuafei1@xxxxxxxxxx/
Changes in v2:
- kvzalloc() call uses 'nps_info->v1.count' instead of '*range_cnt'
- Link to v1: https://lore.kernel.org/lkml/20241028215933.2599271-1-lihuafei1@xxxxxxxxxx/
---
drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c
index 4bd61c169ca8..620090f092ab 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c
@@ -1757,11 +1757,13 @@ int amdgpu_discovery_get_nps_info(struct amdgpu_device *adev,
switch (le16_to_cpu(nps_info->v1.header.version_major)) {
case 1:
+ mem_ranges = kvcalloc(nps_info->v1.count,
+ sizeof(struct amdgpu_gmc_memrange),
+ GFP_KERNEL);
+ if (!mem_ranges)
+ return -ENOMEM;
*nps_type = nps_info->v1.nps_type;
*range_cnt = nps_info->v1.count;
- mem_ranges = kvzalloc(
- *range_cnt * sizeof(struct amdgpu_gmc_memrange),
- GFP_KERNEL);
for (i = 0; i < *range_cnt; i++) {
mem_ranges[i].base_address =
nps_info->v1.instance_info[i].base_address;
--
2.25.1
