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jpeg2000: Validate SOT parsing

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Avoid some overreads.

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
This commit is contained in:
Michael Niedermayer
2013-07-01 10:01:03 +02:00
committed by Luca Barbato
parent 1a3598aae7
commit d3cb302b88
1 changed files with 13 additions and 0 deletions
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13
libavcodec/jpeg2000dec.c
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@@ -423,6 +423,9 @@ static int get_sot(Jpeg2000DecoderContext *s, int n)
return AVERROR_INVALIDDATA;
Isot = bytestream2_get_be16u(&s->g); // Isot
if (Isot >= s->numXtiles * s->numYtiles)
return AVERROR_INVALIDDATA;
if (Isot) {
avpriv_request_sample(s->avctx, "Support for more than one tile");
return AVERROR_PATCHWELCOME;
@@ -433,6 +436,16 @@ static int get_sot(Jpeg2000DecoderContext *s, int n)
/* Read TNSot but not used */
bytestream2_get_byteu(&s->g); // TNsot
if (Psot > bytestream2_get_bytes_left(&s->g) + n + 2) {
av_log(s->avctx, AV_LOG_ERROR, "Psot %d too big\n", Psot);
return AVERROR_INVALIDDATA;
}
if (TPsot >= FF_ARRAY_ELEMS(s->tile[Isot].tile_part)) {
avpriv_request_sample(s->avctx, "Support for %d components", TPsot);
return AVERROR_PATCHWELCOME;
}
tp = s->tile[s->curtileno].tile_part + TPsot;
tp->tile_index = Isot;
tp->tp_len = Psot;