netdev-offload-dpdk: Fix memory leak for matching fragments.

The error paths should release any allocated resources that are not
added to the patterns.

Found by Coverity.

Fixes: c1a5d0e ("netdev-offload-dpdk: Support IPv4 fragmentation types.")
Fixes: 1318929 ("netdev-offload-dpdk: Support IPv6 fragmentation types.")
Signed-off-by: Yunjian Wang <[email protected]>
Reviewed-by: David Marchand <[email protected]>
Signed-off-by: Kevin Traynor <[email protected]>

Author: wyjwang

lib/netdev-offload-dpdk.c

@@ -1526,6 +1526,8 @@ parse_flow_match(struct netdev *netdev,
             } else {
                 VLOG_WARN_RL(&rl, "Unknown IPv4 frag (0x%x/0x%x)",
                              match->flow.nw_frag, match->wc.masks.nw_frag);
+                free(spec);
+                free(mask);
                 return -1;
             }
             consumed_masks->nw_frag = 0;
@@ -1609,6 +1611,8 @@ parse_flow_match(struct netdev *netdev,
             } else {
                 VLOG_WARN_RL(&rl, "Unknown IPv6 frag (0x%x/0x%x)",
                              match->flow.nw_frag, match->wc.masks.nw_frag);
+                free(frag_spec);
+                free(frag_mask);
                 return -1;
             }