drm/amdgpu: prevent NULL pointer dereference if ATIF is not supported

commit a6dd15981c03f2cdc9a351a278f09b5479d53d2e upstream.

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>
(cherry picked from commit 91c9e221fe2553edf2db71627d8453f083de87a1)
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
index 2f250dc861947e293ef42208e5f228010a2b0bfd..592ca0cfe61d0b21d6e7516157b4417f25085906 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
@@ -133,8 +133,8 @@ 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);