sndcp: fixup for coverity scan defect CID 149097
Coverity scan detects a Null pointer deref (FORWARD_NULL) in
gprs_sndcp_comp.c: 67 in gprs_sndcp_comp_create().
The reason for this is that gprs_sndcp_dcomp_init() and also
gprs_sndcp_pcomp_init() rely on the comp_entity->algo algo
flag. If the program logic is correct a null pointer deref
should never occur.
This commit adds OSMO_ASSERT() statements to ensure a null
pointer deref is catched if if the ...comp_init() functions
are used with incorrect parameters.
Change-Id: I7748f06d1739a697edad5100a031e5aa1ef11ed1
diff --git a/openbsc/src/gprs/gprs_sndcp_dcomp.c b/openbsc/src/gprs/gprs_sndcp_dcomp.c
index 489106b..b0f95b4 100644
--- a/openbsc/src/gprs/gprs_sndcp_dcomp.c
+++ b/openbsc/src/gprs/gprs_sndcp_dcomp.c
@@ -84,6 +84,7 @@
if (comp_entity->compclass == SNDCP_XID_DATA_COMPRESSION
&& comp_entity->algo == V42BIS) {
+ OSMO_ASSERT(comp_field->v42bis_params);
comp_entity->state =
v42bis_init(ctx, NULL, comp_field->v42bis_params->p0,
comp_field->v42bis_params->p1,
diff --git a/openbsc/src/gprs/gprs_sndcp_pcomp.c b/openbsc/src/gprs/gprs_sndcp_pcomp.c
index 493b263..a2236c3 100644
--- a/openbsc/src/gprs/gprs_sndcp_pcomp.c
+++ b/openbsc/src/gprs/gprs_sndcp_pcomp.c
@@ -54,6 +54,7 @@
if (comp_entity->compclass == SNDCP_XID_PROTOCOL_COMPRESSION
&& comp_entity->algo == RFC_1144) {
+ OSMO_ASSERT(comp_field->rfc1144_params);
comp_entity->state =
slhc_init(ctx, comp_field->rfc1144_params->s01 + 1,
comp_field->rfc1144_params->s01 + 1);