[FFmpeg-cvslog] avformat/dhav: fix reference point mixup

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Mon Jul 28 15:34:27 2025 +0200| [33ae6cda71e6d34c9081a612abae00e2c7d39f72] | committer: Michael Niedermayer

avformat/dhav: fix reference point mixup

Fixes: reading the duration from before the start of the allocated buffer.

Regression since: 36ec9217e6dca3432304c9d76078d9618247eb0f

Fixes: BIGSLEEP-433513232/test

Found-by: Google Big Sleep
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=33ae6cda71e6d34c9081a612abae00e2c7d39f72
---

 libavformat/dhav.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/dhav.c b/libavformat/dhav.c
index 9bdb23322d..70626c2f2e 100644
--- a/libavformat/dhav.c
+++ b/libavformat/dhav.c
@@ -279,7 +279,7 @@ static int64_t get_duration(AVFormatContext *s)
         }
     }
 
-    if (end_pos < 0 || end_pos + 16 > end_buffer_pos + end_buffer_size)
+    if (end_pos < end_buffer_pos || end_pos + 16 > end_buffer_pos + end_buffer_size)
         goto fail;
 
     date = AV_RL32(end_buffer + (end_pos - end_buffer_pos) + 16);