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Avoid p_stream->m_user_data_length >= (OPJ_UINT64)p_stream->m_byte_offset assertion in opj_stream_get_number_byte_left(). Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=2786. Credit to OSS Fuzz

This commit is contained in:
Even Rouault 2017-07-30 16:48:15 +02:00
parent 1ed8d67797
commit e23e0c94d0
2 changed files with 33 additions and 4 deletions
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20
src/lib/openjp2/cio.c
View File

@ -496,6 +496,26 @@ OPJ_OFF_T opj_stream_read_skip(opj_stream_private_t * p_stream,
}
while (p_size > 0) {
/* Check if we are going beyond the end of file. Most skip_fn do not */
/* check that, but we must be careful not to advance m_byte_offset */
/* beyond m_user_data_length, otherwise */
/* opj_stream_get_number_byte_left() will assert. */
if ((OPJ_UINT64)(p_stream->m_byte_offset + l_skip_nb_bytes + p_size) >
p_stream->m_user_data_length) {
opj_event_msg(p_event_mgr, EVT_INFO, "Stream reached its end !\n");
p_stream->m_byte_offset += l_skip_nb_bytes;
l_skip_nb_bytes = (OPJ_OFF_T)(p_stream->m_user_data_length -
(OPJ_UINT64)p_stream->m_byte_offset);
opj_stream_read_seek(p_stream, (OPJ_OFF_T)p_stream->m_user_data_length,
p_event_mgr);
p_stream->m_status |= OPJ_STREAM_STATUS_END;
/* end if stream */
return l_skip_nb_bytes ? l_skip_nb_bytes : (OPJ_OFF_T) - 1;
}
/* we should do an actual skip on the media */
l_current_skip_nb_bytes = p_stream->m_skip_fn(p_size, p_stream->m_user_data);
if (l_current_skip_nb_bytes == (OPJ_OFF_T) - 1) {

17
src/lib/openjp2/jp2.c
View File

@ -2367,10 +2367,19 @@ static OPJ_BOOL opj_jp2_read_header_procedure(opj_jp2_t *jp2,
jp2->jp2_state |= JP2_STATE_UNKNOWN;
if (opj_stream_skip(stream, l_current_data_size,
p_manager) != l_current_data_size) {
opj_event_msg(p_manager, EVT_ERROR,
"Problem with skipping JPEG2000 box, stream error\n");
opj_free(l_current_data);
return OPJ_FALSE;
if (jp2->jp2_state & JP2_STATE_CODESTREAM) {
/* If we already read the codestream, do not error out */
/* Needed for data/input/nonregression/issue254.jp2 */
opj_event_msg(p_manager, EVT_WARNING,
"Problem with skipping JPEG2000 box, stream error\n");
opj_free(l_current_data);
return OPJ_TRUE;
} else {
opj_event_msg(p_manager, EVT_ERROR,
"Problem with skipping JPEG2000 box, stream error\n");
opj_free(l_current_data);
return OPJ_FALSE;
}
}
}
}