[FFmpeg-devel] [PATCH 09/10] avcodec/alsdec: Use FFABSU()

From: Michael Niedermayer <michael@niedermayer.cc>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: [FFmpeg-devel] [PATCH 09/10] avcodec/alsdec: Use FFABSU()
Date: Thu,  3 Jul 2025 22:12:51 +0200
Message-ID: <20250703201256.3161841-9-michael@niedermayer.cc> (raw)
In-Reply-To: <20250703201256.3161841-1-michael@niedermayer.cc>

Maybe fixes undefined -x80000000 (no doesnt replicate)
Fixes: 70869/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ALS_fuzzer-5476567461986304

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

diff --git a/libavcodec/alsdec.c b/libavcodec/alsdec.c
index 734eec8bf87..0d2fc36d81a 100644
--- a/libavcodec/alsdec.c
+++ b/libavcodec/alsdec.c
@@ -1552,7 +1552,7 @@ static int read_diff_float_data(ALSDecContext *ctx, unsigned int ra_frame) {
                 if (ctx->raw_samples[c][i] != 0) {
                     //The following logic is taken from Tabel 14.45 and 14.46 from the ISO spec
                     if (av_cmp_sf_ieee754(acf[c], FLOAT_1)) {
-                        nbits[i] = 23 - av_log2(abs(ctx->raw_samples[c][i]));
+                        nbits[i] = 23 - av_log2(FFABSU(ctx->raw_samples[c][i]));
                     } else {
                         nbits[i] = 23;
                     }
-- 
2.49.0

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