[PATCH 2/5] drm/i915: fix intel_dp_aux_native_read's reply array size

[Paulo Zanoni <przanoni@gmail.com>]

From: Paulo Zanoni <paulo.r.zanoni@intel.com>

So far we control all the reads an none of them exceeds the current
limit of 20 bytes, but we never think about this when reviewing
patches, so we may at some point in the future overflow the buffer.

My initial patch just added a WARN in case we were about to overflow
the buffer, but Chris suggested to make the size of the array dynamic.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
---
 drivers/gpu/drm/i915/intel_dp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 20e468c..bf0b260 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -564,7 +564,7 @@ intel_dp_aux_native_read(struct intel_dp *intel_dp,
 {
 	uint8_t msg[4];
 	int msg_bytes;
-	uint8_t reply[20];
+	uint8_t reply[recv_bytes + 1];
 	int reply_bytes;
 	uint8_t ack;
 	int ret;
-- 
1.8.3.1