[FFmpeg-cvslog] tools/target_swr_fuzzer: do not use negative numbers of samples

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Sat Nov 30 02:37:44 2024 +0100| [90ff3ae9769dc79fd18400eedc97c352fa73926d] | committer: Michael Niedermayer

tools/target_swr_fuzzer: do not use negative numbers of samples

Fixes: signed integer overflow: -277109688 * 8 cannot be represented in type 'int'
Fixes: 376118159/clusterfuzz-testcase-minimized-ffmpeg_SWR_fuzzer-5884436320681984

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=90ff3ae9769dc79fd18400eedc97c352fa73926d
---

 tools/target_swr_fuzzer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/target_swr_fuzzer.c b/tools/target_swr_fuzzer.c
index 9192d4bed5..f154a11632 100644
--- a/tools/target_swr_fuzzer.c
+++ b/tools/target_swr_fuzzer.c
@@ -98,7 +98,7 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
         av_channel_layout_copy(& in_ch_layout,  &layouts[bytestream2_get_byte(&gbc) % FF_ARRAY_ELEMS(layouts)]);
         av_channel_layout_copy(&out_ch_layout,  &layouts[bytestream2_get_byte(&gbc) % FF_ARRAY_ELEMS(layouts)]);
 
-        out_sample_nb = bytestream2_get_le32(&gbc);
+        out_sample_nb = bytestream2_get_le32(&gbc) & 0x7FFFFFFF;
 
         flags64 = bytestream2_get_le64(&gbc);
         if (flags64 & 0x10)