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| author | Reshetova, Elena <elena.reshetova@intel.com> | 2017-07-04 09:34:57 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-07-04 01:29:04 -0700 |
| commit | d3981bc615f652b9ead0762dd180125ac2b21a3a (patch) | |
| tree | ec29e37211e9ac8e862d019735c539a34dfdabee /net/ipv6 | |
| parent | 271201c09c86cd75e0fd6206bde689176e85aa21 (diff) | |
| download | linux-d3981bc615f652b9ead0762dd180125ac2b21a3a.tar.gz linux-d3981bc615f652b9ead0762dd180125ac2b21a3a.tar.bz2 linux-d3981bc615f652b9ead0762dd180125ac2b21a3a.zip | |
net, ipv6: convert ifmcaddr6.mca_refcnt from atomic_t to refcount_t
refcount_t type and corresponding API should be
used instead of atomic_t when the variable is used as
a reference counter. This allows to avoid accidental
refcounter overflows that might lead to use-after-free
situations.
Signed-off-by: Elena Reshetova <elena.reshetova@intel.com>
Signed-off-by: Hans Liljestrand <ishkamiel@gmail.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: David Windsor <dwindsor@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6')
| -rw-r--r-- | net/ipv6/mcast.c | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c index e2221135858b..12b7c27ce5ce 100644 --- a/net/ipv6/mcast.c +++ b/net/ipv6/mcast.c @@ -701,7 +701,7 @@ static void igmp6_group_dropped(struct ifmcaddr6 *mc) spin_lock_bh(&mc->mca_lock); if (del_timer(&mc->mca_timer)) - atomic_dec(&mc->mca_refcnt); + refcount_dec(&mc->mca_refcnt); spin_unlock_bh(&mc->mca_lock); } @@ -819,12 +819,12 @@ static void mld_clear_delrec(struct inet6_dev *idev) static void mca_get(struct ifmcaddr6 *mc) { - atomic_inc(&mc->mca_refcnt); + refcount_inc(&mc->mca_refcnt); } static void ma_put(struct ifmcaddr6 *mc) { - if (atomic_dec_and_test(&mc->mca_refcnt)) { + if (refcount_dec_and_test(&mc->mca_refcnt)) { in6_dev_put(mc->idev); kfree(mc); } @@ -846,7 +846,7 @@ static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev, mc->mca_users = 1; /* mca_stamp should be updated upon changes */ mc->mca_cstamp = mc->mca_tstamp = jiffies; - atomic_set(&mc->mca_refcnt, 1); + refcount_set(&mc->mca_refcnt, 1); spin_lock_init(&mc->mca_lock); /* initial mode is (EX, empty) */ @@ -1065,7 +1065,7 @@ static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime) return; if (del_timer(&ma->mca_timer)) { - atomic_dec(&ma->mca_refcnt); + refcount_dec(&ma->mca_refcnt); delay = ma->mca_timer.expires - jiffies; } @@ -1074,7 +1074,7 @@ static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime) ma->mca_timer.expires = jiffies + delay; if (!mod_timer(&ma->mca_timer, jiffies + delay)) - atomic_inc(&ma->mca_refcnt); + refcount_inc(&ma->mca_refcnt); ma->mca_flags |= MAF_TIMER_RUNNING; } @@ -1469,7 +1469,7 @@ int igmp6_event_report(struct sk_buff *skb) if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) { spin_lock(&ma->mca_lock); if (del_timer(&ma->mca_timer)) - atomic_dec(&ma->mca_refcnt); + refcount_dec(&ma->mca_refcnt); ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING); spin_unlock(&ma->mca_lock); break; @@ -2391,12 +2391,12 @@ static void igmp6_join_group(struct ifmcaddr6 *ma) spin_lock_bh(&ma->mca_lock); if (del_timer(&ma->mca_timer)) { - atomic_dec(&ma->mca_refcnt); + refcount_dec(&ma->mca_refcnt); delay = ma->mca_timer.expires - jiffies; } if (!mod_timer(&ma->mca_timer, jiffies + delay)) - atomic_inc(&ma->mca_refcnt); + refcount_inc(&ma->mca_refcnt); ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER; spin_unlock_bh(&ma->mca_lock); } |