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Code Issues Releases Activity

avcodec/ffv1dec: Check for bitstream end in decode_line()

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Fixes: timeout
Fixes: 2971/clusterfuzz-testcase-6130678276030464

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 2017-08-14 00:15:55 +02:00
parent c359c51947
commit b9f92093a1
2 changed files with 27 additions and 5 deletions
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24
libavcodec/ffv1dec.c
View File

@ -93,6 +93,19 @@ static inline int get_vlc_symbol(GetBitContext *gb, VlcState *const state,
return ret;
}
static int is_input_end(FFV1Context *s)
{
if (s->ac != AC_GOLOMB_RICE) {
RangeCoder *const c = &s->c;
if (c->overread > MAX_OVERREAD)
return AVERROR_INVALIDDATA;
} else {
if (get_bits_left(&s->gb) < 1)
return AVERROR_INVALIDDATA;
}
return 0;
}
#define TYPE int16_t
#define RENAME(name) name
#include "ffv1dec_template.c"
@ -103,7 +116,7 @@ static inline int get_vlc_symbol(GetBitContext *gb, VlcState *const state,
#define RENAME(name) name ## 32
#include "ffv1dec_template.c"
static void decode_plane(FFV1Context *s, uint8_t *src,
static int decode_plane(FFV1Context *s, uint8_t *src,
int w, int h, int stride, int plane_index,
int pixel_stride)
{
@ -127,11 +140,15 @@ static void decode_plane(FFV1Context *s, uint8_t *src,
// { START_TIMER
if (s->avctx->bits_per_raw_sample <= 8) {
decode_line(s, w, sample, plane_index, 8);
int ret = decode_line(s, w, sample, plane_index, 8);
if (ret < 0)
return ret;
for (x = 0; x < w; x++)
src[x*pixel_stride + stride * y] = sample[1][x];
} else {
decode_line(s, w, sample, plane_index, s->avctx->bits_per_raw_sample);
int ret = decode_line(s, w, sample, plane_index, s->avctx->bits_per_raw_sample);
if (ret < 0)
return ret;
if (s->packed_at_lsb) {
for (x = 0; x < w; x++) {
((uint16_t*)(src + stride*y))[x*pixel_stride] = sample[1][x];
@ -144,6 +161,7 @@ static void decode_plane(FFV1Context *s, uint8_t *src,
}
// STOP_TIMER("decode-line") }
}
return 0;
}
static int decode_slice_header(FFV1Context *f, FFV1Context *fs)

8
libavcodec/ffv1dec_template.c
View File

@ -20,7 +20,7 @@
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
static av_always_inline void RENAME(decode_line)(FFV1Context *s, int w,
static av_always_inline int RENAME(decode_line)(FFV1Context *s, int w,
TYPE *sample[2],
int plane_index, int bits)
{
@ -31,6 +31,9 @@ static av_always_inline void RENAME(decode_line)(FFV1Context *s, int w,
int run_mode = 0;
int run_index = s->run_index;
if (is_input_end(s))
return AVERROR_INVALIDDATA;
if (s->slice_coding_mode == 1) {
int i;
for (x = 0; x < w; x++) {
@ -41,7 +44,7 @@ static av_always_inline void RENAME(decode_line)(FFV1Context *s, int w,
}
sample[1][x] = v;
}
return;
return 0;
}
for (x = 0; x < w; x++) {
@ -101,6 +104,7 @@ static av_always_inline void RENAME(decode_line)(FFV1Context *s, int w,
sample[1][x] = av_mod_uintp2(RENAME(predict)(sample[1] + x, sample[0] + x) + (SUINT)diff, bits);
}
s->run_index = run_index;
return 0;
}
static void RENAME(decode_rgb_frame)(FFV1Context *s, uint8_t *src[3], int w, int h, int stride[3])