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avcodec/jpeg2000dec: Allocate lengthinc and data_start arrays as needed

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Decreases memory requirements
Fixes: OOM
Fixes: 4525/clusterfuzz-testcase-minimized-6400713073623040

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 2017-12-17 18:29:45 +01:00
parent 1083859cb8
commit 42274db1c6
3 changed files with 13 additions and 3 deletions
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3
libavcodec/jpeg2000.c
View File

@ -359,7 +359,6 @@ static int init_prec(Jpeg2000Band *band,
cblk->lblock = 3;
cblk->length = 0;
memset(cblk->lengthinc, 0, sizeof(cblk->lengthinc));
cblk->npasses = 0;
}
@ -607,6 +606,8 @@ void ff_jpeg2000_cleanup(Jpeg2000Component *comp, Jpeg2000CodingStyle *codsty)
Jpeg2000Cblk *cblk = &prec->cblk[cblkno];
av_freep(&cblk->data);
av_freep(&cblk->passes);
av_freep(&cblk->lengthinc);
av_freep(&cblk->data_start);
}
av_freep(&prec->cblk);
}

4
libavcodec/jpeg2000.h
View File

@ -165,14 +165,14 @@ typedef struct Jpeg2000Cblk {
uint8_t ninclpasses; // number coding of passes included in codestream
uint8_t nonzerobits;
uint16_t length;
uint16_t lengthinc[JPEG2000_MAX_PASSES];
uint16_t *lengthinc;
uint8_t nb_lengthinc;
uint8_t lblock;
uint8_t *data;
size_t data_allocated;
int nb_terminations;
int nb_terminationsinc;
int data_start[JPEG2000_MAX_PASSES];
int *data_start;
Jpeg2000Pass *passes;
int coord[2][2]; // border coordinates {{x0, x1}, {y0, y1}}
} Jpeg2000Cblk; // code block

9
libavcodec/jpeg2000dec.c
View File

@ -949,6 +949,7 @@ static int jpeg2000_decode_packet(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile,
for (cblkno = 0; cblkno < nb_code_blocks; cblkno++) {
Jpeg2000Cblk *cblk = prec->cblk + cblkno;
int incl, newpasses, llen;
void *tmp;
if (cblk->npasses)
incl = get_bits(s, 1);
@ -988,6 +989,14 @@ static int jpeg2000_decode_packet(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile,
cblk->nb_lengthinc = 0;
cblk->nb_terminationsinc = 0;
av_free(cblk->lengthinc);
cblk->lengthinc = av_mallocz_array(newpasses , sizeof(*cblk->lengthinc));
if (!cblk->lengthinc)
return AVERROR(ENOMEM);
tmp = av_realloc_array(cblk->data_start, cblk->nb_terminations + newpasses + 1, sizeof(*cblk->data_start));
if (!tmp)
return AVERROR(ENOMEM);
cblk->data_start = tmp;
do {
int newpasses1 = 0;