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Check and handle SMS encoding failure 

The SMS address encoding can fail due to gsm48_encode_bcd_number() which
was not checked for because wrong type was used. Fix this by using
correct type, checking for error and propagating it to the caller.

Change-Id: I9fc16e24f7df5ebad6f4f1b389b2c5e861be95d7
Fixes: CID57882
This commit is contained in:
Max 2017-12-28 17:59:34 +01:00
parent ec54daba5c
commit 82d25f6ea5
1 changed files with 22 additions and 8 deletions
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30
src/osmo-bsc_nat/bsc_nat_rewrite.c
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@ -340,10 +340,10 @@ static char *sms_new_dest_nr(struct bsc_nat *nat, void *ctx,
/**
* This is a helper for GSM 04.11 8.2.5.2 Destination address element
*/
void sms_encode_addr_element(struct msgb *out, const char *new_number,
static bool sms_encode_addr_element(struct msgb *out, const char *new_number,
int format, int tp_data)
{
uint8_t new_addr_len;
int new_addr_len;
uint8_t new_addr[26];
/*
@ -355,6 +355,9 @@ void sms_encode_addr_element(struct msgb *out, const char *new_number,
*/
new_addr_len = gsm48_encode_bcd_number(new_addr, ARRAY_SIZE(new_addr),
1, new_number);
if (new_addr_len < 0)
return false;
new_addr[1] = format;
if (tp_data) {
uint8_t *data = msgb_put(out, new_addr_len);
@ -363,6 +366,8 @@ void sms_encode_addr_element(struct msgb *out, const char *new_number,
} else {
msgb_lv_put(out, new_addr_len - 1, new_addr + 1);
}
return true;
}
static struct msgb *sms_create_new(uint8_t type, uint8_t ref,
@ -391,7 +396,10 @@ static struct msgb *sms_create_new(uint8_t type, uint8_t ref,
msgb_v_put(out, ref);
msgb_lv_put(out, orig_addr_len, orig_addr_ptr);
sms_encode_addr_element(out, new_number, 0x91, 0);
if (!sms_encode_addr_element(out, new_number, 0x91, 0)) {
LOGP(DNAT, LOGL_ERROR, "Failed to encode SMS address.\n");
return NULL;
}
/* Patch the TPDU from here on */
@ -411,11 +419,17 @@ static struct msgb *sms_create_new(uint8_t type, uint8_t ref,
msgb_v_put(out, data_ptr[1]);
/* encode the new number and put it */
if (strncmp(new_dest_nr, "00", 2) == 0)
sms_encode_addr_element(out, new_dest_nr + 2, 0x91, 1);
else
sms_encode_addr_element(out, new_dest_nr, 0x81, 1);
if (strncmp(new_dest_nr, "00", 2) == 0) {
if (!sms_encode_addr_element(out, new_dest_nr + 2, 0x91, 1)) {
LOGP(DNAT, LOGL_ERROR, "Failed to encode SMS address.\n");
return NULL;
}
} else {
if (!sms_encode_addr_element(out, new_dest_nr, 0x81, 1)) {
LOGP(DNAT, LOGL_ERROR, "Failed to encode SMS address.\n");
return NULL;
}
}
/* Copy the rest after the TP-DS */
data = msgb_put(out, data_len - 2 - 1 - old_dest_len);
memcpy(data, &data_ptr[2 + 1 + old_dest_len], data_len - 2 - 1 - old_dest_len);