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avcodec/agm: Check that there is available input in read_code() 

Fixes: Timeout (46sec -> 7ms)
Fixes: 14030/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_AGM_fuzzer-5721258760601600

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-04-02 20:27:13 +02:00
parent d0ca749adb
commit caa9b4ff89
1 changed files with 3 additions and 0 deletions
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libavcodec/agm.c
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@ -103,6 +103,9 @@ static int read_code(GetBitContext *gb, int *oskip, int *level, int *map, int mo
{ {
int len = 0, skip = 0, max; int len = 0, skip = 0, max;
if (get_bits_left(gb) < 2)
return AVERROR_INVALIDDATA;
if (show_bits(gb, 2)) { if (show_bits(gb, 2)) {
switch (show_bits(gb, 4)) { switch (show_bits(gb, 4)) {
case 1: case 1: