lapdm_rslms_recvmsg: Fix memory leak in error path
The caller of lapdm_rslms_recvmsg() (e.g. osmo-bts/src/common/rsl.c)
assumes the message ownership is transferred. However, in one of the
two error paths, msgb_free() was not called and hence we had a memory
leak.
Also clarify the msgb ownership transfer in a comment.
Related: OS#3750
Change-Id: Id60cb45e50bfc89224d97df6c68fcd2949751895
diff --git a/src/gsm/lapdm.c b/src/gsm/lapdm.c
index ba9b3df..d76175b 100644
--- a/src/gsm/lapdm.c
+++ b/src/gsm/lapdm.c
@@ -1269,7 +1269,8 @@
return rc;
}
-/*! Receive a RSLms \ref msgb from Layer 3 */
+/*! Receive a RSLms \ref msgb from Layer 3. 'msg' ownership is transferred,
+ * i.e. caller must not free it */
int lapdm_rslms_recvmsg(struct msgb *msg, struct lapdm_channel *lc)
{
struct abis_rsl_common_hdr *rslh = msgb_l2(msg);
@@ -1277,6 +1278,7 @@
if (msgb_l2len(msg) < sizeof(*rslh)) {
LOGP(DLLAPD, LOGL_ERROR, "Message too short RSL hdr!\n");
+ msgb_free(msg);
return -EINVAL;
}