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pnmdec: make sure v is capped by maxval 

Otherwise put_bits can be called with a value that doesn't fit in the
sample_len, causing an assertion failure.

Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
This commit is contained in:
Andreas Cadhalpun 2016-11-09 01:09:35 +01:00
parent 484151df7c
commit cdb5479c9d
1 changed files with 7 additions and 3 deletions
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10
libavcodec/pnmdec.c
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@ -43,7 +43,7 @@ static int pnm_decode_frame(AVCodecContext *avctx, void *data,
int buf_size = avpkt->size;
PNMContext * const s = avctx->priv_data;
AVFrame * const p = data;
int i, j, n, linesize, h, upgrade = 0, is_mono = 0;
int i, j, k, n, linesize, h, upgrade = 0, is_mono = 0;
unsigned char *ptr;
int components, sample_len, ret;
@ -143,10 +143,14 @@ static int pnm_decode_frame(AVCodecContext *avctx, void *data,
v = (*s->bytestream++)&1;
} else {
/* read a sequence of digits */
do {
for (k = 0; k < 5 && c <= 9; k += 1) {
v = 10*v + c;
c = (*s->bytestream++) - '0';
} while (c <= 9);
}
if (v > s->maxval) {
av_log(avctx, AV_LOG_ERROR, "value %d larger than maxval %d\n", v, s->maxval);
return AVERROR_INVALIDDATA;
}
}
if (sample_len == 16) {
((uint16_t*)ptr)[j] = (((1<<sample_len)-1)*v + (s->maxval>>1))/s->maxval;