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new 70286d59f1 avcodec/exr: Check input space before reverse_lut()
70286d59f1 is described below
commit 70286d59f1bd413009c28dea22ab69649fa87490
Author: Michael Niedermayer <[email protected]>
AuthorDate: Fri Mar 13 00:51:14 2026 +0100
Commit: Michael Niedermayer <[email protected]>
CommitDate: Sat Mar 14 23:24:11 2026 +0100
avcodec/exr: Check input space before reverse_lut()
Fixes: use of uninitialized memory
Fixes:
490707906/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_EXR_DEC_fuzzer-6310933506097152
Found-by: continuous fuzzing process
https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <[email protected]>
---
libavcodec/exr.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/libavcodec/exr.c b/libavcodec/exr.c
index a0f00a7cf1..c7fcd302cd 100644
--- a/libavcodec/exr.c
+++ b/libavcodec/exr.c
@@ -637,6 +637,9 @@ static int piz_uncompress(const EXRContext *s, const
uint8_t *src, int ssize,
max_non_zero - min_non_zero + 1);
memset(td->bitmap + max_non_zero + 1, 0, BITMAP_SIZE - max_non_zero - 1);
+ if (bytestream2_get_bytes_left(&gb) < 4)
+ return AVERROR_INVALIDDATA;
+
maxval = reverse_lut(td->bitmap, td->lut);
bytestream2_skip(&gb, 4);
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