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ipv6: convert fib6_ref to refcount_t

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We suspect some issues involving fib6_ref 0 -> 1 transitions might
cause strange syzbot reports.

Lets convert fib6_ref to refcount_t to catch them earlier.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Wei Wang <weiwan@google.com>
Acked-by: Wei Wang <weiwan@google.com>
Reviewed-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2019-04-22 18:35:03 -07:00
committed by David S. Miller
parent 5ea715289a
commit f05713e091
3 changed files with 8 additions and 8 deletions
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8
include/net/ip6_fib.h
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@ -146,7 +146,7 @@ struct fib6_info {
struct list_head fib6_siblings;
unsigned int fib6_nsiblings;
atomic_t fib6_ref;
refcount_t fib6_ref;
unsigned long expires;
struct dst_metrics *fib6_metrics;
#define fib6_pmtu fib6_metrics->metrics[RTAX_MTU-1]
@ -284,17 +284,17 @@ void fib6_info_destroy_rcu(struct rcu_head *head);
static inline void fib6_info_hold(struct fib6_info *f6i)
{
atomic_inc(&f6i->fib6_ref);
refcount_inc(&f6i->fib6_ref);
}
static inline bool fib6_info_hold_safe(struct fib6_info *f6i)
{
return atomic_inc_not_zero(&f6i->fib6_ref);
return refcount_inc_not_zero(&f6i->fib6_ref);
}
static inline void fib6_info_release(struct fib6_info *f6i)
{
if (f6i && atomic_dec_and_test(&f6i->fib6_ref))
if (f6i && refcount_dec_and_test(&f6i->fib6_ref))
call_rcu(&f6i->rcu, fib6_info_destroy_rcu);
}