Commit d3576d034e for ffmpeg

commit d3576d034e111cc830c455b9244aa812981387b6
Author: Michael Niedermayer <michael@niedermayer.cc>
Date:   Wed Oct 7 00:06:08 2026 +0200

    avformat/rdt: Allocate the RMStream of a stream only once

    A repeated ASMRuleBook line allocated a new RMStream for every stream it
    had already set up, leaking the old one.

    Memory leak Replicated through UnModified FFmpeg with ASAN
    Found during triage of the security report PXsIMPp0wPaW

diff --git a/libavformat/rdt.c b/libavformat/rdt.c
index 725793eb01..7bab6ce522 100644
--- a/libavformat/rdt.c
+++ b/libavformat/rdt.c
@@ -440,6 +440,8 @@ rdt_parse_sdp_line (AVFormatContext *s, int st_index,
                            (count - rdt->nb_rmst) * sizeof(*rdt->rmst));
                     rdt->nb_rmst = count;
                 }
+                if (rdt->rmst[s->streams[n]->index])
+                    continue;
                 rdt->rmst[s->streams[n]->index] = ff_rm_alloc_rmstream();
                 if (!rdt->rmst[s->streams[n]->index])
                     return AVERROR(ENOMEM);