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[FFmpeg-devel,02/11] avcodec/proresdec: Consider negative bits left

Message ID 20240720005241.726089-2-michael@niedermayer.cc
State New
Headers show
Series [FFmpeg-devel,01/11] avcodec/alsdec: Clear shift_value | expand

Commit Message

Michael Niedermayer July 20, 2024, 12:52 a.m. UTC 
Fixes: 70036/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_PRORES_fuzzer-6298797647396864
Fixes: shift exponent 40 is too large for 32-bit type 'uint32_t' (aka 'unsigned int')

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavcodec/proresdec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/libavcodec/proresdec.c b/libavcodec/proresdec.c
index ec1d0bd0be9..6a256107b49 100644
--- a/libavcodec/proresdec.c
+++ b/libavcodec/proresdec.c
@@ -511,7 +511,7 @@  static av_always_inline int decode_ac_coeffs(AVCodecContext *avctx, GetBitContex
 
     for (pos = block_mask;;) {
         bits_left = gb->size_in_bits - re_index;
-        if (!bits_left || (bits_left < 32 && !SHOW_UBITS(re, gb, bits_left)))
+        if (bits_left <= 0 || (bits_left < 32 && !SHOW_UBITS(re, gb, bits_left)))
             break;
 
         DECODE_CODEWORD(run, run_to_cb[FFMIN(run,  15)], LAST_SKIP_BITS);