[viogpu] Fix EDID ExtensionFlag check

elizashurov · YanVugenfirer · commit 271b7a87f5d3 · 2026-01-29T13:42:41.000+02:00
ExtensionFlag is a 1-byte array; checking it as a pointer is always true and can make us assume extensions exist.
Check ExtensionFlag[0] instead so we only parse extension blocks when present.

Signed-off-by: Elizabeth Ashurov &lt;eashurov@redhat.com&gt;
diff --git a/viogpu/viogpudo/viogpudo.cpp b/viogpu/viogpudo/viogpudo.cpp
@@ -2394,7 +2394,7 @@ PBYTE VioGpuAdapter::GetCTA861Data(void)
     if (m_bEDID)
     {
         PEDID_DATA_V1 edid_data = (PEDID_DATA_V1)m_EDIDs;
-        if (edid_data->ExtensionFlag)
+        if (edid_data->ExtensionFlag[0])
         {
             PEDID_CTA_861 cta_data = (PEDID_CTA_861)(m_EDIDs + EDID_V1_BLOCK_SIZE);
             if (cta_data->ExtentionTag[0] >= 2 && cta_data->Revision[0] >= 3)

Original file line number	Diff line number	Diff line change
`@@ -2394,7 +2394,7 @@ PBYTE VioGpuAdapter::GetCTA861Data(void)`
`2394`	`2394`	`if (m_bEDID)`
`2395`	`2395`	`{`
`2396`	`2396`	`PEDID_DATA_V1 edid_data = (PEDID_DATA_V1)m_EDIDs;`
`2397`		`- if (edid_data->ExtensionFlag)`
	`2397`	`+ if (edid_data->ExtensionFlag[0])`
`2398`	`2398`	`{`
`2399`	`2399`	`PEDID_CTA_861 cta_data = (PEDID_CTA_861)(m_EDIDs + EDID_V1_BLOCK_SIZE);`
`2400`	`2400`	`if (cta_data->ExtentionTag[0] >= 2 && cta_data->Revision[0] >= 3)`