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[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 <jbohac@suse.cz>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jiri Bohac 2007-02-08 16:02:21 -08:00 committed by David S. Miller
parent 42c05f6e6e
commit 1539b98b56
1 changed files with 16 additions and 8 deletions
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24
net/ipx/af_ipx.c
View File

@ -2035,19 +2035,27 @@ static void __exit ipx_proto_finito(void)
ipxitf_cleanup();
unregister_snap_client(pSNAP_datalink);
pSNAP_datalink = NULL;
if (pSNAP_datalink) {
unregister_snap_client(pSNAP_datalink);
pSNAP_datalink = NULL;
}
unregister_8022_client(p8022_datalink);
p8022_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);