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-rw-r--r--main/udptl.c48
1 files changed, 21 insertions, 27 deletions
diff --git a/main/udptl.c b/main/udptl.c
index d120c27fb..eba362e65 100644
--- a/main/udptl.c
+++ b/main/udptl.c
@@ -217,38 +217,29 @@ static int decode_length(uint8_t *buf, unsigned int limit, unsigned int *len, un
}
*pvalue = (buf[*len] & 0x3F) << 14;
(*len)++;
- /* Indicate we have a fragment */
+ /* We have a fragment. Currently we don't process fragments. */
+ ast_debug(1, "UDPTL packet with length greater than 16K received, decoding will fail\n");
return 1;
}
/*- End of function --------------------------------------------------------*/
static int decode_open_type(uint8_t *buf, unsigned int limit, unsigned int *len, const uint8_t **p_object, unsigned int *p_num_octets)
{
- unsigned int octet_cnt;
- unsigned int octet_idx;
- unsigned int i;
- int length; /* a negative length indicates the limit has been reached in decode_length. */
- const uint8_t **pbuf;
+ unsigned int octet_cnt = 0;
- for (octet_idx = 0, *p_num_octets = 0; ; octet_idx += octet_cnt) {
- octet_cnt = 0;
- if ((length = decode_length(buf, limit, len, &octet_cnt)) < 0)
- return -1;
- if (octet_cnt > 0) {
- *p_num_octets += octet_cnt;
+ if (decode_length(buf, limit, len, &octet_cnt) != 0)
+ return -1;
- pbuf = &p_object[octet_idx];
- i = 0;
- /* Make sure the buffer contains at least the number of bits requested */
- if ((*len + octet_cnt) > limit)
- return -1;
+ if (octet_cnt > 0) {
+ /* Make sure the buffer contains at least the number of bits requested */
+ if ((*len + octet_cnt) > limit)
+ return -1;
- *pbuf = &buf[*len];
- *len += octet_cnt;
- }
- if (length == 0)
- break;
+ *p_num_octets = octet_cnt;
+ *p_object = &buf[*len];
+ *len += octet_cnt;
}
+
return 0;
}
/*- End of function --------------------------------------------------------*/
@@ -335,8 +326,8 @@ static int udptl_rx_packet(struct ast_udptl *s, uint8_t *buf, unsigned int len)
const uint8_t *data;
unsigned int ifp_len;
int repaired[16];
- const uint8_t *bufs[16];
- unsigned int lengths[16];
+ const uint8_t *bufs[ARRAY_LEN(s->f) - 1];
+ unsigned int lengths[ARRAY_LEN(s->f) - 1];
int span;
int entries;
int ifp_no;
@@ -366,13 +357,13 @@ static int udptl_rx_packet(struct ast_udptl *s, uint8_t *buf, unsigned int len)
do {
if ((stat2 = decode_length(buf, len, &ptr, &count)) < 0)
return -1;
- for (i = 0; i < count; i++) {
+ for (i = 0; i < count && total_count + i < ARRAY_LEN(bufs); i++) {
if ((stat1 = decode_open_type(buf, len, &ptr, &bufs[total_count + i], &lengths[total_count + i])) != 0)
return -1;
}
- total_count += count;
+ total_count += i;
}
- while (stat2 > 0);
+ while (stat2 > 0 && total_count < ARRAY_LEN(bufs));
/* Step through in reverse order, so we go oldest to newest */
for (i = total_count; i > 0; i--) {
if (seq_no - i >= s->rx_seq_no) {
@@ -435,6 +426,9 @@ static int udptl_rx_packet(struct ast_udptl *s, uint8_t *buf, unsigned int len)
if (ptr + 1 > len)
return -1;
entries = buf[ptr++];
+ if (entries > MAX_FEC_ENTRIES) {
+ return -1;
+ }
s->rx[x].fec_entries = entries;
/* Decode the elements */