libmsc: gsm340_gen_oa_sub() may return negative value
gsm340_gen_oa() returns a negative value if the output buffer that the
caller passes is too small, so we have to check the return value of this
function.
Fixes: CID 174178
Fixes: CID 174179
Change-Id: I47215d7d89771730a7f84efa8aeeb187a0911fdb
diff --git a/src/libmsc/gsm_04_11.c b/src/libmsc/gsm_04_11.c
index 261e5cd..eede74c 100644
--- a/src/libmsc/gsm_04_11.c
+++ b/src/libmsc/gsm_04_11.c
@@ -215,9 +215,9 @@
{
uint8_t *smsp;
uint8_t oa[12]; /* max len per 03.40 */
- uint8_t oa_len = 0;
uint8_t octet_len;
unsigned int old_msg_len = msg->len;
+ int oa_len;
/* generate first octet with masked bits */
smsp = msgb_put(msg, 1);
@@ -235,6 +235,9 @@
/* generate originator address */
oa_len = gsm340_gen_oa_sub(oa, sizeof(oa), &sms->src);
+ if (oa_len < 0)
+ return -ENOSPC;
+
smsp = msgb_put(msg, oa_len);
memcpy(smsp, oa, oa_len);
@@ -284,9 +287,9 @@
struct gsm_sms *sms)
{
unsigned int old_msg_len = msg->len;
- uint8_t oa_len = 0;
uint8_t oa[12]; /* max len per 03.40 */
uint8_t *smsp;
+ int oa_len;
/* generate first octet with masked bits */
smsp = msgb_put(msg, 1);
@@ -298,8 +301,12 @@
/* TP-MR (message reference) */
smsp = msgb_put(msg, 1);
*smsp = sms->msg_ref;
+
/* generate recipient address */
oa_len = gsm340_gen_oa_sub(oa, sizeof(oa), &sms->dst);
+ if (oa_len < 0)
+ return -ENOSPC;
+
smsp = msgb_put(msg, oa_len);
memcpy(smsp, oa, oa_len);