diff options
| author |   Gao feng <gaofeng@cn.fujitsu.com> | 2012-10-04 20:15:48 +0000 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2012-10-07 00:30:56 -0400 |
| commit | 6dc878a8ca39e93f70c42f3dd7260bde10c1e0f1 (patch) | |
| tree | 2549dc75d29ea1975611775b05921482caf75c04 /include/linux/netlink.h | |
| parent | Merge branch 'uapi-prep' of git://git.infradead.org/users/dhowells/linux-headers (diff) | |
| download | wireguard-linux-6dc878a8ca39e93f70c42f3dd7260bde10c1e0f1.tar.xz wireguard-linux-6dc878a8ca39e93f70c42f3dd7260bde10c1e0f1.zip | |
netlink: add reference of module in netlink_dump_start
I get a panic when I use ss -a and rmmod inet_diag at the
same time.
It's because netlink_dump uses inet_diag_dump which belongs to module
inet_diag.
I search the codes and find many modules have the same problem. We
need to add a reference to the module which the cb->dump belongs to.
Thanks for all help from Stephen,Jan,Eric,Steffen and Pablo.
Change From v3:
change netlink_dump_start to inline,suggestion from Pablo and
Eric.
Change From v2:
delete netlink_dump_done,and call module_put in netlink_dump
and netlink_sock_destruct.
Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/netlink.h')
| -rw-r--r-- | include/linux/netlink.h | 20 |
1 files changed, 16 insertions, 4 deletions
diff --git a/include/linux/netlink.h b/include/linux/netlink.h index f80c56ac4d82..6d3af05c107c 100644 --- a/include/linux/netlink.h +++ b/include/linux/netlink.h @@ -245,6 +245,8 @@ struct netlink_callback { struct netlink_callback *cb); int (*done)(struct netlink_callback *cb); void *data; + /* the module that dump function belong to */ + struct module *module; u16 family; u16 min_dump_alloc; unsigned int prev_seq, seq; @@ -262,14 +264,24 @@ __nlmsg_put(struct sk_buff *skb, u32 portid, u32 seq, int type, int len, int fla struct netlink_dump_control { int (*dump)(struct sk_buff *skb, struct netlink_callback *); - int (*done)(struct netlink_callback*); + int (*done)(struct netlink_callback *); void *data; + struct module *module; u16 min_dump_alloc; }; -extern int netlink_dump_start(struct sock *ssk, struct sk_buff *skb, - const struct nlmsghdr *nlh, - struct netlink_dump_control *control); +extern int __netlink_dump_start(struct sock *ssk, struct sk_buff *skb, + const struct nlmsghdr *nlh, + struct netlink_dump_control *control); +static inline int netlink_dump_start(struct sock *ssk, struct sk_buff *skb, + const struct nlmsghdr *nlh, + struct netlink_dump_control *control) +{ + if (!control->module) + control->module = THIS_MODULE; + + return __netlink_dump_start(ssk, skb, nlh, control); +} #endif /* __KERNEL__ */ |