Commit 860267bd62 for ffmpeg

commit 860267bd6288dfe8ec6c662dc75af955504257c8
Author: Michael Niedermayer <michael@niedermayer.cc>
Date:   Sun Oct 4 23:44:39 2026 +0200

    avformat/mov: accept ipma associations with property_index 0

    ISO/IEC 23008-12 defines a property_index of 0 as no property being
    associated, but mov_read_iprp() rejected it, and with it the whole file.

    Found during triage of the security report srZp1wXh4CXQ

    Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

diff --git a/libavformat/mov.c b/libavformat/mov.c
index fb1b91772b..a7400aba06 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -9985,7 +9985,9 @@ static int mov_read_iprp(MOVContext *c, AVIOContext *pb, MOVAtom atom)
                 index <<= 8;
                 index |= avio_r8(pb);
             }
-            if (index > nb_atoms || index <= 0) {
+            if (!index)
+                continue;
+            if (index > nb_atoms) {
                 ret = AVERROR_INVALIDDATA;
                 goto fail;
             }