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drm/amdgpu: add upper bound check on user inputs in wait ioctl

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Huge input values in amdgpu_userq_wait_ioctl can lead to a OOM and
could be exploited.

So check these input value against AMDGPU_USERQ_MAX_HANDLES
which is big enough value for genuine use cases and could
potentially avoid OOM.

v2: squash in Srini's fix

Signed-off-by: Sunil Khatri <sunil.khatri@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Sunil Khatri 2026-02-24 12:13:09 +05:30 committed by Alex Deucher
parent be267e15f9
commit fcec012c66
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/amd/amdgpu/amdgpu_userq_fence.c
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@ -635,6 +635,11 @@ int amdgpu_userq_wait_ioctl(struct drm_device *dev, void *data,
if (!amdgpu_userq_enabled(dev))
return -ENOTSUPP;
if (wait_info->num_syncobj_handles > AMDGPU_USERQ_MAX_HANDLES ||
wait_info->num_bo_write_handles > AMDGPU_USERQ_MAX_HANDLES ||
wait_info->num_bo_read_handles > AMDGPU_USERQ_MAX_HANDLES)
return -EINVAL;
num_syncobj = wait_info->num_syncobj_handles;
syncobj_handles = memdup_array_user(u64_to_user_ptr(wait_info->syncobj_handles),
num_syncobj, sizeof(u32));