net: fix NULL pointer reference in cipso_v4_doi_free

In netlbl_cipsov4_add_std() when 'doi_def->map.std' alloc
failed, we sometime observe panic:

  BUG: kernel NULL pointer dereference, address:
  ...
  RIP: 0010:cipso_v4_doi_free+0x3a/0x80
  ...
  Call Trace:
   netlbl_cipsov4_add_std+0xf4/0x8c0
   netlbl_cipsov4_add+0x13f/0x1b0
   genl_family_rcv_msg_doit.isra.15+0x132/0x170
   genl_rcv_msg+0x125/0x240

This is because in cipso_v4_doi_free() there is no check
on 'doi_def->map.std' when 'doi_def->type' equal 1, which
is possibe, since netlbl_cipsov4_add_std() haven't initialize
it before alloc 'doi_def->map.std'.

This patch just add the check to prevent panic happen for similar
cases.

Reported-by: Abaci <abaci@linux.alibaba.com>
Signed-off-by: Michael Wang <yun.wang@linux.alibaba.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/cipso_ipv4.c b/net/ipv4/cipso_ipv4.c
index 099259f..7fbd0b5 100644 (file)
--- a/net/ipv4/cipso_ipv4.c
+++ b/net/ipv4/cipso_ipv4.c
@@ -465,14 +465,16 @@ void cipso_v4_doi_free(struct cipso_v4_doi *doi_def)
        if (!doi_def)
                return;
 
-       switch (doi_def->type) {
-       case CIPSO_V4_MAP_TRANS:
-               kfree(doi_def->map.std->lvl.cipso);
-               kfree(doi_def->map.std->lvl.local);
-               kfree(doi_def->map.std->cat.cipso);
-               kfree(doi_def->map.std->cat.local);
-               kfree(doi_def->map.std);
-               break;
+       if (doi_def->map.std) {
+               switch (doi_def->type) {
+               case CIPSO_V4_MAP_TRANS:
+                       kfree(doi_def->map.std->lvl.cipso);
+                       kfree(doi_def->map.std->lvl.local);
+                       kfree(doi_def->map.std->cat.cipso);
+                       kfree(doi_def->map.std->cat.local);
+                       kfree(doi_def->map.std);
+                       break;
+               }
        }
        kfree(doi_def);
 }