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Subject: edid-decode: if offset < 4, then check for non-zero padding
Author: Hans Verkuil <hverkuil-ci...@xs4all.nl>
Date: Thu Oct 26 12:34:24 2023 +0200
There was a check for non-zero padding if offset >= 4, but not
for when it is < 4. Add this.
Signed-off-by: Hans Verkuil <hverkuil-ci...@xs4all.nl>
parse-cta-block.cpp | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
---
diff --git a/parse-cta-block.cpp b/parse-cta-block.cpp
index ac337141526c..0a6013c64576 100644
--- a/parse-cta-block.cpp
+++ b/parse-cta-block.cpp
@@ -2873,8 +2873,15 @@ void edid_state::parse_cta_block(const unsigned char *x)
}
}
- if (offset < 4)
+ if (offset < 4) {
+ // Offset 0 means that there are no data blocks or DTDs,
+ // so the remainder must be padding.
+ if (!memchk(x + 4, 127 - 4)) {
+ data_block = "Padding";
+ fail("Contains non-zero bytes.\n");
+ }
break;
+ }
if (version >= 3) {
unsigned i;
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