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avcodec/diracdec: Propagate errors from dirac_get_arith_uint() 

Testcase: 11663/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_DIRAC_fuzzer-5636791864918016

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 2019-01-08 23:29:38 +01:00
parent 6dde65d7c0
commit 6ed3d0e01c
3 changed files with 5 additions and 0 deletions
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1
libavcodec/dirac_arith.c
View File

@ -115,6 +115,7 @@ void ff_dirac_init_arith_decoder(DiracArith *c, GetBitContext *gb, int length)
c->counter = -16;
c->range = 0xffff;
c->error = 0;
for (i = 0; i < DIRAC_CTX_COUNT; i++)
c->contexts[i] = 0x8000;

2
libavcodec/dirac_arith.h
View File

@ -81,6 +81,7 @@ typedef struct {
const uint8_t *bytestream_end;
uint16_t contexts[DIRAC_CTX_COUNT];
int error;
} DiracArith;
extern const uint8_t ff_dirac_next_ctx[DIRAC_CTX_COUNT];
@ -173,6 +174,7 @@ static inline int dirac_get_arith_uint(DiracArith *c, int follow_ctx, int data_c
while (!dirac_get_arith_bit(c, follow_ctx)) {
if (ret >= 0x40000000) {
av_log(NULL, AV_LOG_ERROR, "dirac_get_arith_uint overflow\n");
c->error = AVERROR_INVALIDDATA;
return -1;
}
ret <<= 1;

2
libavcodec/diracdec.c
View File

@ -537,6 +537,8 @@ static inline int codeblock(DiracContext *s, SubBand *b,
buf = b->ibuf + top * b->stride;
if (is_arith) {
for (y = top; y < bottom; y++) {
if (c->error)
return c->error;
for (x = left; x < right; x++) {
if (b->pshift) {
coeff_unpack_arith_10(c, qfactor, qoffset, b, (int32_t*)(buf)+x, x, y);