[FFmpeg-cvslog] avformat/kvag: Check sample_rate

[Michael Niedermayer]

ffmpeg | branch: release/4.3 | Michael Niedermayer <michael at niedermayer.cc> | Mon Apr 29 23:44:25 2024 +0200| [98a7a5000f9ee2d48dfa960017bc6c2b7d60ba99] | committer: Michael Niedermayer

avformat/kvag: Check sample_rate

Fixes: Division by 0
Fixes: -copyts -start_at_zero -itsoffset 00:00:01 -itsscale 1 -ss 00:00:02  -i zgclab/ffmpeg_crash/poc1 output.mp4

Found-by: Wang Dawei and Zhou Geng, from Zhongguancun Laboratory
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit c26a762ea1bf028a33554a5f7a18d8dd7d82f5a8)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=98a7a5000f9ee2d48dfa960017bc6c2b7d60ba99
---

 libavformat/kvag.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/libavformat/kvag.c b/libavformat/kvag.c
index 8f641873b9..2c65c3e376 100644
--- a/libavformat/kvag.c
+++ b/libavformat/kvag.c
@@ -31,7 +31,7 @@
 typedef struct KVAGHeader {
     uint32_t    magic;
     uint32_t    data_size;
-    uint32_t    sample_rate;
+    int    sample_rate;
     uint16_t    stereo;
 } KVAGHeader;
 
@@ -65,6 +65,9 @@ static int kvag_read_header(AVFormatContext *s)
     hdr.sample_rate             = AV_RL32(buf +  8);
     hdr.stereo                  = AV_RL16(buf + 12);
 
+    if (hdr.sample_rate <= 0)
+        return AVERROR_INVALIDDATA;
+
     par                         = st->codecpar;
     par->codec_type             = AVMEDIA_TYPE_AUDIO;
     par->codec_id               = AV_CODEC_ID_ADPCM_IMA_SSI;