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new 745680c2d2 avformat/mov: bound iloc/iinf item counts by the box size
745680c2d2 is described below
commit 745680c2d2fce7a87b4fe861d2b1fc2534349ae7
Author: Hawthorn <[email protected]>
AuthorDate: Mon Aug 17 20:09:49 2026 +0530
Commit: Hawthorn <[email protected]>
CommitDate: Mon Aug 17 14:41:27 2026 +0000
avformat/mov: bound iloc/iinf item counts by the box size
mov_read_iloc() and mov_read_iinf() read a 16- or 32-bit item/entry
count from the file and pass it straight to av_realloc_array() with no
limit, so a small box can drive a multi-gigabyte allocation before the
read loop hits EOF. Reject counts larger than the remaining box size,
matching the existing sgpd bound.
Signed-off-by: Hawthorn <[email protected]>
---
libavformat/mov.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/libavformat/mov.c b/libavformat/mov.c
index 5a66d572ee..fcec8d1633 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -9435,6 +9435,9 @@ static int mov_read_iloc(MOVContext *c, AVIOContext *pb,
MOVAtom atom)
}
item_count = (version < 2) ? avio_rb16(pb) : avio_rb32(pb);
+ if (item_count > atom.size)
+ return AVERROR_INVALIDDATA;
+
heif_item = av_realloc_array(c->heif_item, FFMAX(item_count,
c->nb_heif_item), sizeof(*c->heif_item));
if (!heif_item)
return AVERROR(ENOMEM);
@@ -9593,6 +9596,9 @@ static int mov_read_iinf(MOVContext *c, AVIOContext *pb,
MOVAtom atom)
avio_rb24(pb); // flags.
entry_count = version ? avio_rb32(pb) : avio_rb16(pb);
+ if (entry_count > atom.size)
+ return AVERROR_INVALIDDATA;
+
heif_item = av_realloc_array(c->heif_item, FFMAX(entry_count,
c->nb_heif_item), sizeof(*c->heif_item));
if (!heif_item)
return AVERROR(ENOMEM);
--
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