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Properly check the bounds of arrays when decoding UDPTL packets. Also, remove broken support for receiving UDPTL packets larger than 16k. That shouldn't ever happen anyway.

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AST-2011-002
FAX-281


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@308413 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Matthew Nicholson
2011-02-21 14:57:15 +00:00
parent 788e66cf20
commit 2e714923c3
1 changed files with 23 additions and 26 deletions
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39
main/udptl.c
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@@ -173,37 +173,31 @@ static int decode_length(uint8_t *buf, int limit, int *len, int *pvalue)
} }
*pvalue = (buf[*len] & 0x3F) << 14; *pvalue = (buf[*len] & 0x3F) << 14;
(*len)++; (*len)++;
/* Indicate we have a fragment */ /* We have a fragment. Currently we don't process fragments. */
if (option_debug) {
ast_log(LOG_DEBUG, "UDPTL packet with length greater than 16K received, decoding will fail\n");
}
return 1; return 1;
} }
/*- End of function --------------------------------------------------------*/ /*- End of function --------------------------------------------------------*/
static int decode_open_type(uint8_t *buf, int limit, int *len, const uint8_t **p_object, int *p_num_octets) static int decode_open_type(uint8_t *buf, int limit, int *len, const uint8_t **p_object, int *p_num_octets)
{ {
int octet_cnt; int octet_cnt = 0;
int octet_idx;
int stat;
int i;
const uint8_t **pbuf;
for (octet_idx = 0, *p_num_octets = 0; ; octet_idx += octet_cnt) { if (decode_length(buf, limit, len, &octet_cnt) != 0)
if ((stat = decode_length(buf, limit, len, &octet_cnt)) < 0)
return -1; return -1;
if (octet_cnt > 0) {
*p_num_octets += octet_cnt;
pbuf = &p_object[octet_idx]; if (octet_cnt > 0) {
i = 0;
/* Make sure the buffer contains at least the number of bits requested */ /* Make sure the buffer contains at least the number of bits requested */
if ((*len + octet_cnt) > limit) if ((*len + octet_cnt) > limit)
return -1; return -1;
*pbuf = &buf[*len]; *p_num_octets = octet_cnt;
*p_object = &buf[*len];
*len += octet_cnt; *len += octet_cnt;
} }
if (stat == 0)
break;
}
return 0; return 0;
} }
/*- End of function --------------------------------------------------------*/ /*- End of function --------------------------------------------------------*/
@@ -288,8 +282,8 @@ static int udptl_rx_packet(struct ast_udptl *s, uint8_t *buf, int len)
const uint8_t *data; const uint8_t *data;
int ifp_len; int ifp_len;
int repaired[16]; int repaired[16];
const uint8_t *bufs[16]; const uint8_t *bufs[ARRAY_LEN(s->f) - 1];
int lengths[16]; int lengths[ARRAY_LEN(s->f) - 1];
int span; int span;
int entries; int entries;
int ifp_no; int ifp_no;
@@ -319,13 +313,13 @@ static int udptl_rx_packet(struct ast_udptl *s, uint8_t *buf, int len)
do { do {
if ((stat2 = decode_length(buf, len, &ptr, &count)) < 0) if ((stat2 = decode_length(buf, len, &ptr, &count)) < 0)
return -1; return -1;
for (i = 0; i < count; i++) { for (i = 0; i < count && total_count + i < ARRAY_LEN(bufs); i++) {
if ((stat = decode_open_type(buf, len, &ptr, &bufs[total_count + i], &lengths[total_count + i])) != 0) if ((stat = decode_open_type(buf, len, &ptr, &bufs[total_count + i], &lengths[total_count + i])) != 0)
return -1; 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 */ /* Step through in reverse order, so we go oldest to newest */
for (i = total_count; i > 0; i--) { for (i = total_count; i > 0; i--) {
if (seq_no - i >= s->rx_seq_no) { if (seq_no - i >= s->rx_seq_no) {
@@ -388,6 +382,9 @@ static int udptl_rx_packet(struct ast_udptl *s, uint8_t *buf, int len)
if (ptr + 1 > len) if (ptr + 1 > len)
return -1; return -1;
entries = buf[ptr++]; entries = buf[ptr++];
if (entries > MAX_FEC_ENTRIES) {
return -1;
}
s->rx[x].fec_entries = entries; s->rx[x].fec_entries = entries;
/* Decode the elements */ /* Decode the elements */