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The following commit(s) were added to refs/heads/master by this push:
new f6a95c7eb7 avformat/img2dec: reject input images too big to fit into a
single packet
f6a95c7eb7 is described below
commit f6a95c7eb786f895812adaaa08d2fe91c4d4caf8
Author: Timo Rothenpieler <[email protected]>
AuthorDate: Wed Dec 31 03:41:21 2025 +0100
Commit: Timo Rothenpieler <[email protected]>
CommitDate: Wed Dec 31 14:37:58 2025 +0000
avformat/img2dec: reject input images too big to fit into a single packet
Not entirely sure if it should instead use some entirely different
approach here, given that images exceeding 2GB don't seem that crazy
to me, but so far processing such images results in a heap overflow,
since the size addition overflows and a much too small packet is
allocated and its size never checked again when writing into it.
Fixes #YWH-PGM40646-32
---
libavformat/img2dec.c | 18 +++++++++++++++---
1 file changed, 15 insertions(+), 3 deletions(-)
diff --git a/libavformat/img2dec.c b/libavformat/img2dec.c
index 8f1c9013ca..586634c0c3 100644
--- a/libavformat/img2dec.c
+++ b/libavformat/img2dec.c
@@ -365,8 +365,10 @@ int ff_img_read_packet(AVFormatContext *s1, AVPacket *pkt)
VideoDemuxData *s = s1->priv_data;
AVBPrint filename;
int i, res;
- int size[3] = { 0 }, ret[3] = { 0 };
- AVIOContext *f[3] = { NULL };
+ int ret[3] = { 0 };
+ int64_t size[3] = { 0 };
+ int64_t total_size;
+ AVIOContext *f[3] = { NULL };
AVCodecParameters *par = s1->streams[0]->codecpar;
av_bprint_init(&filename, 0, AV_BPRINT_SIZE_UNLIMITED);
@@ -456,7 +458,17 @@ int ff_img_read_packet(AVFormatContext *s1, AVPacket *pkt)
}
}
- res = av_new_packet(pkt, size[0] + size[1] + size[2]);
+ total_size = size[0];
+ if (total_size > INT64_MAX - size[1])
+ return AVERROR_INVALIDDATA;
+ total_size += size[1];
+ if (total_size > INT64_MAX - size[2])
+ return AVERROR_INVALIDDATA;
+ total_size += size[2];
+ if (total_size > INT_MAX)
+ return AVERROR_INVALIDDATA;
+
+ res = av_new_packet(pkt, total_size);
if (res < 0) {
goto fail;
}
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