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drm/radeon: fix null pointer dereference in dce6+ audio code 

Don't crash if the encoder does not have an afmt struct.

bug:
https://bugs.freedesktop.org/show_bug.cgi?id=72283

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Alex Deucher 2013-12-03 17:45:14 -05:00
parent 0ca223b029
commit 53dc0b0c94
1 changed files with 7 additions and 5 deletions
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12
drivers/gpu/drm/radeon/dce6_afmt.c
View File

@ -93,11 +93,13 @@ void dce6_afmt_select_pin(struct drm_encoder *encoder)
struct radeon_device *rdev = encoder->dev->dev_private;
struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;
u32 offset = dig->afmt->offset;
u32 offset;
if (!dig->afmt->pin)
if (!dig || !dig->afmt || !dig->afmt->pin)
return;
offset = dig->afmt->offset;
WREG32(AFMT_AUDIO_SRC_CONTROL + offset,
AFMT_AUDIO_SRC_SELECT(dig->afmt->pin->id));
}
@ -112,7 +114,7 @@ void dce6_afmt_write_latency_fields(struct drm_encoder *encoder,
struct radeon_connector *radeon_connector = NULL;
u32 tmp = 0, offset;
if (!dig->afmt->pin)
if (!dig || !dig->afmt || !dig->afmt->pin)
return;
offset = dig->afmt->pin->offset;
@ -156,7 +158,7 @@ void dce6_afmt_write_speaker_allocation(struct drm_encoder *encoder)
u8 *sadb;
int sad_count;
if (!dig->afmt->pin)
if (!dig || !dig->afmt || !dig->afmt->pin)
return;
offset = dig->afmt->pin->offset;
@ -217,7 +219,7 @@ void dce6_afmt_write_sad_regs(struct drm_encoder *encoder)
{ AZ_F0_CODEC_PIN_CONTROL_AUDIO_DESCRIPTOR13, HDMI_AUDIO_CODING_TYPE_WMA_PRO },
};
if (!dig->afmt->pin)
if (!dig || !dig->afmt || !dig->afmt->pin)
return;
offset = dig->afmt->pin->offset;