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drm/amdgpu: Fix snprintf usage in amdgpu_gfx_kiq_init_ring

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This commit fixes a format truncation issue arosed by the snprintf
function potentially writing more characters into the ring->name buffer
than it can hold, in the amdgpu_gfx_kiq_init_ring function

The issue occurred because the '%d' format specifier could write between
1 and 10 bytes into a region of size between 0 and 8, depending on the
values of xcc_id, ring->me, ring->pipe, and ring->queue. The snprintf
function could output between 12 and 41 bytes into a destination of size
16, leading to potential truncation.

To resolve this, the snprintf line was modified to use the '%hhu' format
specifier for xcc_id, ring->me, ring->pipe, and ring->queue. The '%hhu'
specifier is used for unsigned char variables and ensures that these
values are printed as unsigned decimal integers.

Fixes the below with gcc W=1:
drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c: In function ‘amdgpu_gfx_kiq_init_ring’:
drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c:332:61: warning: ‘%d’ directive output may be truncated writing between 1 and 10 bytes into a region of size between 0 and 8 [-Wformat-truncation=]
  332 |         snprintf(ring->name, sizeof(ring->name), "kiq_%d.%d.%d.%d",
      |                                                             ^~
drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c:332:50: note: directive argument in the range [0, 2147483647]
  332 |         snprintf(ring->name, sizeof(ring->name), "kiq_%d.%d.%d.%d",
      |                                                  ^~~~~~~~~~~~~~~~~
drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c:332:9: note: ‘snprintf’ output between 12 and 41 bytes into a destination of size 16
  332 |         snprintf(ring->name, sizeof(ring->name), "kiq_%d.%d.%d.%d",
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  333 |                  xcc_id, ring->me, ring->pipe, ring->queue);
      |                  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Fixes: 345a36c4f1 ("drm/amdgpu: prefer snprintf over sprintf")
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Christian König <christian.koenig@amd.com>
Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam@amd.com>
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Srinivasan Shanmugam 2024-05-21 10:03:37 +05:30 • committed by Alex Deucher
parent 806e8c5579
commit 0ea5544555
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
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@ -329,7 +329,7 @@ int amdgpu_gfx_kiq_init_ring(struct amdgpu_device *adev, int xcc_id)
ring->eop_gpu_addr = kiq->eop_gpu_addr;
ring->no_scheduler = true;
snprintf(ring->name, sizeof(ring->name), "kiq_%d.%d.%d.%d",
snprintf(ring->name, sizeof(ring->name), "kiq_%hhu.%hhu.%hhu.%hhu",
xcc_id, ring->me, ring->pipe, ring->queue);
r = amdgpu_ring_init(adev, ring, 1024, irq, AMDGPU_CP_KIQ_IRQ_DRIVER0,
AMDGPU_RING_PRIO_DEFAULT, NULL);