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Git pushed a commit to branch release/8.0
in repository ffmpeg.

commit 79cc97bf7d757d3ae41ef9b8b95187031047ab29
Author:     Michael Niedermayer <[email protected]>
AuthorDate: Sat May 16 20:35:11 2026 +0200
Commit:     Michael Niedermayer <[email protected]>
CommitDate: Thu Jun 18 05:09:43 2026 +0200

    avformat/dashdec: Fail with any inner stream count being 0
    
    Fixes: ada-3-poc.mpd
    
    Found-by: Claude and Ada Logics. This issue was found by Anthropic from 
using agents to study security of open source projects, and I am from Ada 
Logics helping validate the found issues and report to maintainers.
    Signed-off-by: Michael Niedermayer <[email protected]>
    (cherry picked from commit b99c6fc8c362062f00f1eafd763d4449ad2ad512)
    Signed-off-by: Michael Niedermayer <[email protected]>
---
 libavformat/dashdec.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/libavformat/dashdec.c b/libavformat/dashdec.c
index b93e0b24a1..81334c2cdc 100644
--- a/libavformat/dashdec.c
+++ b/libavformat/dashdec.c
@@ -2069,6 +2069,8 @@ static int dash_read_header(AVFormatContext *s)
 
         if (ret)
             return ret;
+        if (rep->ctx->nb_streams == 0)
+            return AVERROR_PATCHWELCOME;
         rep->stream_index = stream_index;
         ++stream_index;
     }
@@ -2087,6 +2089,8 @@ static int dash_read_header(AVFormatContext *s)
 
         if (ret)
             return ret;
+        if (rep->ctx->nb_streams == 0)
+            return AVERROR_PATCHWELCOME;
         rep->stream_index = stream_index;
         ++stream_index;
     }
@@ -2105,6 +2109,8 @@ static int dash_read_header(AVFormatContext *s)
 
         if (ret)
             return ret;
+        if (rep->ctx->nb_streams == 0)
+            return AVERROR_PATCHWELCOME;
         rep->stream_index = stream_index;
         ++stream_index;
     }

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