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| author | David Woodhouse <David.Woodhouse@intel.com> | 2012-11-28 00:46:45 +0000 |
|---|---|---|
| committer | David Woodhouse <David.Woodhouse@intel.com> | 2012-12-02 00:05:16 +0000 |
| commit | d71ffeb12378243babb2227acfed0c8d263e237e (patch) | |
| tree | 06c451e078f5e11a6ce8135ef0c4539ca6e0e82c /net/atm/br2684.c | |
| parent | 0e56d99a5b557c760394d6941d7d1fc8d279eff3 (diff) | |
| download | linux-d71ffeb12378243babb2227acfed0c8d263e237e.tar.gz linux-d71ffeb12378243babb2227acfed0c8d263e237e.tar.bz2 linux-d71ffeb12378243babb2227acfed0c8d263e237e.zip | |
br2684: fix module_put() race
The br2684 code used module_put() during unassignment from vcc with
hope that we have BKL. This assumption is no longer true.
Now owner field in atmvcc is used to move this module_put()
to vcc_destroy_socket().
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Acked-by: Krzysztof Mazur <krzysiek@podlesie.net>
Diffstat (limited to 'net/atm/br2684.c')
| -rw-r--r-- | net/atm/br2684.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/net/atm/br2684.c b/net/atm/br2684.c index 4de3ae7bc3e2..6dc383c90262 100644 --- a/net/atm/br2684.c +++ b/net/atm/br2684.c @@ -69,6 +69,7 @@ struct br2684_vcc { void (*old_push)(struct atm_vcc *vcc, struct sk_buff *skb); void (*old_pop)(struct atm_vcc *vcc, struct sk_buff *skb); void (*old_release_cb)(struct atm_vcc *vcc); + struct module *old_owner; enum br2684_encaps encaps; struct list_head brvccs; #ifdef CONFIG_ATM_BR2684_IPFILTER @@ -414,8 +415,8 @@ static void br2684_close_vcc(struct br2684_vcc *brvcc) brvcc->atmvcc->user_back = NULL; /* what about vcc->recvq ??? */ brvcc->atmvcc->release_cb = brvcc->old_release_cb; brvcc->old_push(brvcc->atmvcc, NULL); /* pass on the bad news */ + module_put(brvcc->old_owner); kfree(brvcc); - module_put(THIS_MODULE); } /* when AAL5 PDU comes in: */ @@ -590,10 +591,12 @@ static int br2684_regvcc(struct atm_vcc *atmvcc, void __user * arg) brvcc->old_push = atmvcc->push; brvcc->old_pop = atmvcc->pop; brvcc->old_release_cb = atmvcc->release_cb; + brvcc->old_owner = atmvcc->owner; barrier(); atmvcc->push = br2684_push; atmvcc->pop = br2684_pop; atmvcc->release_cb = br2684_release_cb; + atmvcc->owner = THIS_MODULE; /* initialize netdev carrier state */ if (atmvcc->dev->signal == ATM_PHY_SIG_LOST) |