joel16/android_kernel_sony_msm8994
1
0
Fork 0
mirror of https://github.com/joel16/android_kernel_sony_msm8994.git synced 2024-11-23 04:00:20 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

netlink: Fix dump skb leak/double free

Browse Source 
When we free cb->skb after a dump, we do it after releasing the
lock.  This means that a new dump could have started in the time
being and we'll end up freeing their skb instead of ours.

This patch saves the skb and module before we unlock so we free
the right memory.

Fixes: 16b304f3404f ("netlink: Eliminate kmalloc in netlink dump operation.")
Reported-by: Baozeng Ding <sploving1@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2016-05-16 17:28:16 +08:00 committed by Olivier Karasangabo
parent 1d5e2e8605
commit 428d82f4c2
No known key found for this signature in database
GPG Key ID: C5C93AF8ED1CCEB5
1 changed files with 5 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
net/netlink/af_netlink.c
View File

@ -2448,6 +2448,7 @@ static int netlink_dump(struct sock *sk)
struct netlink_callback *cb;
struct sk_buff *skb = NULL;
struct nlmsghdr *nlh;
struct module *module;
int len, err = -ENOBUFS;
int alloc_size;
@ -2497,9 +2498,11 @@ static int netlink_dump(struct sock *sk)
cb->done(cb);
nlk->cb_running = false;
module = cb->module;
skb = cb->skb;
mutex_unlock(nlk->cb_mutex);
module_put(cb->module);
consume_skb(cb->skb);
module_put(module);
consume_skb(skb);
return 0;
errout_skb: