[FFmpeg-cvslog] [ffmpeg] branch master updated. 0469d68acb avcodec/exr: Check for pixel type consistency in DWA

[ffmpeg-git at ffmpeg.org]

The branch, master has been updated
       via  0469d68acb52081ca8385b844b9650398242be0f (commit)
      from  069201c53561795bc18e55d1e2eb84dc03cf1ed3 (commit)


- Log -----------------------------------------------------------------
commit 0469d68acb52081ca8385b844b9650398242be0f
Author:     Michael Niedermayer <michael at niedermayer.cc>
AuthorDate: Sat Aug 9 14:05:19 2025 +0200
Commit:     Michael Niedermayer <michael at niedermayer.cc>
CommitDate: Tue Aug 12 12:21:09 2025 +0200

    avcodec/exr: Check for pixel type consistency in DWA
    
    Fixes: out of array access
    Fixes: BIGSLEEP-436511754/testcase.exr
    
    Found-by: Google Big Sleep
    Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

diff --git a/libavcodec/exr.c b/libavcodec/exr.c
index dea612a42b..67f971ff35 100644
--- a/libavcodec/exr.c
+++ b/libavcodec/exr.c
@@ -2086,6 +2086,17 @@ static int decode_frame(AVCodecContext *avctx, AVFrame *picture,
     if ((ret = decode_header(s, picture)) < 0)
         return ret;
 
+    if (s->compression == EXR_DWAA ||
+        s->compression == EXR_DWAB) {
+        for (int i = 0; i<s->nb_channels; i++) {
+            EXRChannel *channel = &s->channels[i];
+            if (channel->pixel_type != s->pixel_type) {
+                avpriv_request_sample(s->avctx, "mixed pixel type DWA");
+                return AVERROR_PATCHWELCOME;
+            }
+        }
+    }
+
     switch (s->pixel_type) {
     case EXR_HALF:
         if (s->channel_offsets[3] >= 0) {

-----------------------------------------------------------------------

Summary of changes:
 libavcodec/exr.c | 11 +++++++++++
 1 file changed, 11 insertions(+)


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