From 41c6d650f6537e55a1b53438c646fbc3f49176bf Mon Sep 17 00:00:00 2001 From: "Reshetova, Elena" Date: Fri, 30 Jun 2017 13:08:01 +0300 Subject: net: convert sock.sk_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. This patch uses refcount_inc_not_zero() instead of atomic_inc_not_zero_hint() due to absense of a _hint() version of refcount API. If the hint() version must be used, we might need to revisit API. Signed-off-by: Elena Reshetova Signed-off-by: Hans Liljestrand Signed-off-by: Kees Cook Signed-off-by: David Windsor Signed-off-by: David S. Miller --- net/packet/af_packet.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'net/packet') diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index 90fd38d5c458..643302b37b48 100644 --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -4495,7 +4495,7 @@ static int packet_seq_show(struct seq_file *seq, void *v) seq_printf(seq, "%pK %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n", s, - atomic_read(&s->sk_refcnt), + refcount_read(&s->sk_refcnt), s->sk_type, ntohs(po->num), po->ifindex, -- cgit