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avcodec/smacker: Check space before decoding type 

Fixes: Timeout (232sec -> 280ms)
Fixes: 19682/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SMACKER_fuzzer-5654129649385472

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 2020-01-01 20:43:05 +01:00
parent 2b5b9d5dac
commit 6f5c18da59
1 changed files with 4 additions and 0 deletions
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4
libavcodec/smacker.c
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@ -398,6 +398,8 @@ static av_always_inline int smk_get_code(GetBitContext *gb, int *recode, int *la
int v;
while(*table & SMK_NODE) {
if (get_bits_left(gb) < 1)
return AVERROR_INVALIDDATA;
if(get_bits1(gb))
table += (*table) & (~SMK_NODE);
table++;
@ -462,6 +464,8 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
uint16_t pix;
type = smk_get_code(&gb, smk->type_tbl, smk->type_last);
if (type < 0)
return type;
run = block_runs[(type >> 2) & 0x3F];
switch(type & 3){
case SMK_BLK_MONO: