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lavc/jpeg2000dec: Support reading 64-bit atom size.

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Fixes ticket #6935.
This commit is contained in:
Carl Eugen Hoyos
2017-12-27 23:18:58 +01:00
parent ad73b32d29
commit 658bdc6771
1 changed files with 10 additions and 1 deletions
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11
libavcodec/jpeg2000dec.c
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@@ -2009,7 +2009,16 @@ static int jp2_find_codestream(Jpeg2000DecoderContext *s)
bytestream2_get_bytes_left(&s->g) >= 8) { bytestream2_get_bytes_left(&s->g) >= 8) {
atom_size = bytestream2_get_be32u(&s->g); atom_size = bytestream2_get_be32u(&s->g);
atom = bytestream2_get_be32u(&s->g); atom = bytestream2_get_be32u(&s->g);
atom_end = bytestream2_tell(&s->g) + atom_size - 8; if (atom_size == 1) {
if (bytestream2_get_be32u(&s->g)) {
avpriv_request_sample(s->avctx, "Huge atom");
return 0;
}
atom_size = bytestream2_get_be32u(&s->g);
atom_end = bytestream2_tell(&s->g) + atom_size - 16;
} else {
atom_end = bytestream2_tell(&s->g) + atom_size - 8;
}
if (atom == JP2_CODESTREAM) if (atom == JP2_CODESTREAM)
return 1; return 1;