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video-anc: Fix bounds checks when parsing VBI data

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We were reading more bytes than we allocated.

https://bugzilla.gnome.org/show_bug.cgi?id=797363
This commit is contained in:
Sebastian Dröge 2018-11-01 19:19:03 +02:00
parent e074eff5ef
commit 4666444955
1 changed files with 4 additions and 4 deletions
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8
gst-libs/gst/video/video-anc.c
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@ -95,7 +95,7 @@ get_ancillary_16 (GstVideoVBIParser * parser, GstVideoAncillary * anc)
g_return_val_if_fail (parser != NULL, GST_VIDEO_VBI_PARSER_RESULT_ERROR);
g_return_val_if_fail (anc != NULL, GST_VIDEO_VBI_PARSER_RESULT_ERROR);
while (parser->offset < parser->work_data_size + SMALLEST_ANC_SIZE) {
while (parser->offset + SMALLEST_ANC_SIZE < parser->work_data_size) {
guint8 DID, SDID, DC;
guint i;
@ -116,7 +116,7 @@ get_ancillary_16 (GstVideoVBIParser * parser, GstVideoAncillary * anc)
SDID = data[parser->offset + 4] & 0xff;
DC = data[parser->offset + 5] & 0xff;
/* Check if we have enough room to get the User Data */
if (parser->offset >= parser->work_data_size + SMALLEST_ANC_SIZE + DC)
if (parser->offset + SMALLEST_ANC_SIZE + DC >= parser->work_data_size)
goto not_enough_data;
/* We found a valid ANC \o/ */
@ -155,7 +155,7 @@ get_ancillary_8 (GstVideoVBIParser * parser, GstVideoAncillary * anc)
g_return_val_if_fail (parser != NULL, GST_VIDEO_VBI_PARSER_RESULT_ERROR);
g_return_val_if_fail (anc != NULL, GST_VIDEO_VBI_PARSER_RESULT_ERROR);
while (parser->offset < parser->work_data_size + SMALLEST_ANC_SIZE) {
while (parser->offset + SMALLEST_ANC_SIZE < parser->work_data_size) {
guint8 DID, SDID, DC;
guint i;
@ -171,7 +171,7 @@ get_ancillary_8 (GstVideoVBIParser * parser, GstVideoAncillary * anc)
SDID = data[parser->offset + 4];
DC = data[parser->offset + 5];
/* Check if we have enough room to get the User Data */
if (parser->offset >= parser->work_data_size + SMALLEST_ANC_SIZE + DC)
if (parser->offset + SMALLEST_ANC_SIZE + DC >= parser->work_data_size)
goto not_enough_data;
/* We found a valid ANC \o/ */