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avformat/rtmppkt: Convert ff_amf_tag_size() to bytestream2

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Fixes: out of array accesses
Fixes: crash-9238fa9e8d4fde3beda1f279626f53812cb001cb-SEGV

Found-by: JunDong Xie of Ant-financial Light-Year Security Lab
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-07-28 13:41:59 +02:00
parent 36ea41de37
commit 08c073434e
1 changed files with 48 additions and 20 deletions
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68
libavformat/rtmppkt.c
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@ -433,50 +433,78 @@ void ff_rtmp_packet_destroy(RTMPPacket *pkt)
pkt->size = 0;
}
int ff_amf_tag_size(const uint8_t *data, const uint8_t *data_end)
static int amf_tag_skip(GetByteContext *gb)
{
const uint8_t *base = data;
AMFDataType type;
unsigned nb = -1;
int parse_key = 1;
if (data >= data_end)
if (bytestream2_get_bytes_left(gb) < 1)
return -1;
switch ((type = *data++)) {
case AMF_DATA_TYPE_NUMBER: return 9;
case AMF_DATA_TYPE_BOOL: return 2;
case AMF_DATA_TYPE_STRING: return 3 + AV_RB16(data);
case AMF_DATA_TYPE_LONG_STRING: return 5 + AV_RB32(data);
case AMF_DATA_TYPE_NULL: return 1;
case AMF_DATA_TYPE_DATE: return 11;
type = bytestream2_get_byte(gb);
switch (type) {
case AMF_DATA_TYPE_NUMBER:
bytestream2_get_be64(gb);
return 0;
case AMF_DATA_TYPE_BOOL:
bytestream2_get_byte(gb);
return 0;
case AMF_DATA_TYPE_STRING:
bytestream2_skip(gb, bytestream2_get_be16(gb));
return 0;
case AMF_DATA_TYPE_LONG_STRING:
bytestream2_skip(gb, bytestream2_get_be32(gb));
return 0;
case AMF_DATA_TYPE_NULL:
return 0;
case AMF_DATA_TYPE_DATE:
bytestream2_skip(gb, 10);
return 0;
case AMF_DATA_TYPE_ARRAY:
parse_key = 0;
case AMF_DATA_TYPE_MIXEDARRAY:
nb = bytestream_get_be32(&data);
nb = bytestream2_get_be32(gb);
case AMF_DATA_TYPE_OBJECT:
while (nb-- > 0 || type != AMF_DATA_TYPE_ARRAY) {
int t;
if (parse_key) {
int size = bytestream_get_be16(&data);
int size = bytestream2_get_be16(gb);
if (!size) {
data++;
bytestream2_get_byte(gb);
break;
}
if (size < 0 || size >= data_end - data)
if (size < 0 || size >= bytestream2_get_bytes_left(gb))
return -1;
data += size;
bytestream2_skip(gb, size);
}
t = ff_amf_tag_size(data, data_end);
if (t < 0 || t >= data_end - data)
t = amf_tag_skip(gb);
if (t < 0 || bytestream2_get_bytes_left(gb) <= 0)
return -1;
data += t;
}
return data - base;
case AMF_DATA_TYPE_OBJECT_END: return 1;
return 0;
case AMF_DATA_TYPE_OBJECT_END: return 0;
default: return -1;
}
}
int ff_amf_tag_size(const uint8_t *data, const uint8_t *data_end)
{
GetByteContext gb;
int ret;
if (data >= data_end)
return -1;
bytestream2_init(&gb, data, data_end - data);
ret = amf_tag_skip(&gb);
if (ret < 0 || bytestream2_get_bytes_left(&gb) <= 0)
return -1;
av_assert0(bytestream2_tell(&gb) >= 0 && bytestream2_tell(&gb) <= data_end - data);
return bytestream2_tell(&gb);
}
int ff_amf_get_field_value(const uint8_t *data, const uint8_t *data_end,
const uint8_t *name, uint8_t *dst, int dst_size)
{