msgb: Check the return value of msgb_alloc (Coverity)
In some places, the return value of msgb_alloc/msgb_alloc_headroom
is not checked before it is dereferenced.
This commit adds NULL checks to return with -ENOMEM from the calling
functions if the alloc function has failed.
Fixes: Coverity CID 1249692, 1293376
Sponsored-by: On-Waves ehf
diff --git a/src/gsm/lapdm.c b/src/gsm/lapdm.c
index 698f850..54d3a0b 100644
--- a/src/gsm/lapdm.c
+++ b/src/gsm/lapdm.c
@@ -675,6 +675,9 @@
struct gsm_time gt;
struct msgb *msg = msgb_alloc_headroom(512, 64, "RSL CHAN RQD");
+ if (!msg)
+ return -ENOMEM;
+
msg->l2h = msgb_push(msg, sizeof(*ch));
ch = (struct abis_rsl_cchan_hdr *)msg->l2h;
rsl_init_cchan_hdr(ch, RSL_MT_CHAN_RQD);