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[FFmpeg-devel] avformat/flvdec: Check double before cast in parse_keyframes_index()

Message ID 20210126160839.8083-1-michael@niedermayer.cc
State New
Headers show
Series [FFmpeg-devel] avformat/flvdec: Check double before cast in parse_keyframes_index()
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Commit Message

Michael Niedermayer Jan. 26, 2021, 4:08 p.m. UTC
Fixes: -2.21166e+304 is outside the range of representable values of type 'long'
Fixes: 29169/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-5725452796821504

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavformat/flvdec.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)
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Patch

diff --git a/libavformat/flvdec.c b/libavformat/flvdec.c
index 07ef342278..5230b69617 100644
--- a/libavformat/flvdec.c
+++ b/libavformat/flvdec.c
@@ -446,9 +446,13 @@  static int parse_keyframes_index(AVFormatContext *s, AVIOContext *ioc, int64_t m
         }
 
         for (i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++) {
+            double d;
             if (avio_r8(ioc) != AMF_DATA_TYPE_NUMBER)
                 goto invalid;
-            current_array[0][i] = av_int2double(avio_rb64(ioc));
+            d = av_int2double(avio_rb64(ioc));
+            if (isnan(d) || d < INT64_MIN || d > INT64_MAX)
+                goto invalid;
+            current_array[0][i] = d;
         }
         if (times && filepositions) {
             // All done, exiting at a position allowing amf_parse_object