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| author | Antonio Quartulli <antonio@mandelbit.com> | 2024-10-31 16:28:48 +0100 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2024-11-04 12:05:16 -0500 |
| commit | 91c9e221fe2553edf2db71627d8453f083de87a1 (patch) | |
| tree | 93508120eea4785da470248d86c263b90c2335a0 /drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c | |
| parent | 69516fbdba6c809c70a2c8c633c3a34361e9d3f0 (diff) | |
| download | linux-91c9e221fe2553edf2db71627d8453f083de87a1.tar.gz linux-91c9e221fe2553edf2db71627d8453f083de87a1.tar.bz2 linux-91c9e221fe2553edf2db71627d8453f083de87a1.zip | |
drm/amdgpu: prevent NULL pointer dereference if ATIF is not supported
acpi_evaluate_object() may return AE_NOT_FOUND (failure), which
would result in dereferencing buffer.pointer (obj) while being NULL.
Although this case may be unrealistic for the current code, it is
still better to protect against possible bugs.
Bail out also when status is AE_NOT_FOUND.
This fixes 1 FORWARD_NULL issue reported by Coverity
Report: CID 1600951: Null pointer dereferences (FORWARD_NULL)
Signed-off-by: Antonio Quartulli <antonio@mandelbit.com>
Fixes: c9b7c809b89f ("drm/amd: Guard against bad data for ATIF ACPI method")
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Link: https://lore.kernel.org/r/20241031152848.4716-1-antonio@mandelbit.com
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c')
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c index cce85389427f..b8d4e07d2043 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c @@ -172,8 +172,8 @@ static union acpi_object *amdgpu_atif_call(struct amdgpu_atif *atif, &buffer); obj = (union acpi_object *)buffer.pointer; - /* Fail if calling the method fails and ATIF is supported */ - if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { + /* Fail if calling the method fails */ + if (ACPI_FAILURE(status)) { DRM_DEBUG_DRIVER("failed to evaluate ATIF got %s\n", acpi_format_exception(status)); kfree(obj); |