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drm/msm/adreno: fix userspace-triggered crash on a2xx-a4xx

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Before a5xx Adreno driver will not try fetching UBWC params (because
those generations didn't support UBWC anyway), however it's still
possible to query UBWC-related params from the userspace, triggering
possible NULL pointer dereference. Check for UBWC config in
adreno_get_param() and return sane defaults if there is none.

Fixes: a452510aad ("drm/msm/adreno: Switch to the common UBWC config struct")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Reviewed-by: Rob Clark <rob.clark@oss.qualcomm.com>
Patchwork: https://patchwork.freedesktop.org/patch/717778/
Message-ID: <20260411-adreno-fix-ubwc-v3-1-4983156f3f80@oss.qualcomm.com>
Signed-off-by: Rob Clark <robin.clark@oss.qualcomm.com>
This commit is contained in:
Dmitry Baryshkov 2026-04-11 17:59:15 +03:00 committed by Rob Clark
parent e64bca6364
commit 2b4abf8793
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/msm/adreno/adreno_gpu.c
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@ -424,15 +424,21 @@ int adreno_get_param(struct msm_gpu *gpu, struct msm_context *ctx,
*value = vm->mm_range;
return 0;
case MSM_PARAM_HIGHEST_BANK_BIT:
if (!adreno_gpu->ubwc_config)
return UERR(ENOENT, drm, "no UBWC on this platform");
*value = adreno_gpu->ubwc_config->highest_bank_bit;
return 0;
case MSM_PARAM_RAYTRACING:
*value = adreno_gpu->has_ray_tracing;
return 0;
case MSM_PARAM_UBWC_SWIZZLE:
if (!adreno_gpu->ubwc_config)
return UERR(ENOENT, drm, "no UBWC on this platform");
*value = adreno_gpu->ubwc_config->ubwc_swizzle;
return 0;
case MSM_PARAM_MACROTILE_MODE:
if (!adreno_gpu->ubwc_config)
return UERR(ENOENT, drm, "no UBWC on this platform");
*value = adreno_gpu->ubwc_config->macrotile_mode;
return 0;
case MSM_PARAM_UCHE_TRAP_BASE: