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>

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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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drivers/gpu/drm/msm/adreno/adreno_gpu.c

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