From: Jiri Bohac <[EMAIL PROTECTED]>
[IPX]: Fix NULL pointer dereference on ipx unload
Fixes a null pointer dereference when unloading the ipx module.
On initialization of the ipx module, registering certain packet
types can fail. When this happens, unloading the module later
dereferences NULL pointers. This patch fixes that. Please apply.
Signed-off-by: Jiri Bohac <[EMAIL PROTECTED]>
Signed-off-by: David S. Miller <[EMAIL PROTECTED]>
Signed-off-by: Greg Kroah-Hartman <[EMAIL PROTECTED]>
---
net/ipx/af_ipx.c | 26 +++++++++++++++++---------
1 file changed, 17 insertions(+), 9 deletions(-)
--- linux-2.6.20.1.orig/net/ipx/af_ipx.c
+++ linux-2.6.20.1/net/ipx/af_ipx.c
@@ -2035,19 +2035,27 @@ static void __exit ipx_proto_finito(void
ipxitf_cleanup();
- unregister_snap_client(pSNAP_datalink);
- pSNAP_datalink = NULL;
-
- unregister_8022_client(p8022_datalink);
- p8022_datalink = NULL;
+ if (pSNAP_datalink) {
+ unregister_snap_client(pSNAP_datalink);
+ pSNAP_datalink = NULL;
+ }
+
+ if (p8022_datalink) {
+ unregister_8022_client(p8022_datalink);
+ p8022_datalink = NULL;
+ }
dev_remove_pack(&ipx_8023_packet_type);
- destroy_8023_client(p8023_datalink);
- p8023_datalink = NULL;
+ if (p8023_datalink) {
+ destroy_8023_client(p8023_datalink);
+ p8023_datalink = NULL;
+ }
dev_remove_pack(&ipx_dix_packet_type);
- destroy_EII_client(pEII_datalink);
- pEII_datalink = NULL;
+ if (pEII_datalink) {
+ destroy_EII_client(pEII_datalink);
+ pEII_datalink = NULL;
+ }
proto_unregister(&ipx_proto);
sock_unregister(ipx_family_ops.family);
--
-
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