Netdev Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Yajun Deng <yajun.deng@linux.dev>
To: davem@davemloft.net, kuba@kernel.org, yoshfuji@linux-ipv6.org,
	dsahern@kernel.org
Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-decnet-user@lists.sourceforge.net,
	Yajun Deng <yajun.deng@linux.dev>
Subject: [PATCH] net: convert fib_treeref from int to refcount_t
Date: Thu, 29 Jul 2021 15:13:50 +0800	[thread overview]
Message-ID: <20210729071350.28919-1-yajun.deng@linux.dev> (raw)

refcount_t type should be used instead of int when fib_treeref is used as
a reference counter,and avoid use-after-free risks.

Signed-off-by: Yajun Deng <yajun.deng@linux.dev>
---
 include/net/dn_fib.h     | 2 +-
 include/net/ip_fib.h     | 2 +-
 net/decnet/dn_fib.c      | 6 +++---
 net/ipv4/fib_semantics.c | 8 ++++----
 4 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/include/net/dn_fib.h b/include/net/dn_fib.h
index ccc6e9df178b..ddd6565957b3 100644
--- a/include/net/dn_fib.h
+++ b/include/net/dn_fib.h
@@ -29,7 +29,7 @@ struct dn_fib_nh {
 struct dn_fib_info {
 	struct dn_fib_info	*fib_next;
 	struct dn_fib_info	*fib_prev;
-	int 			fib_treeref;
+	refcount_t		fib_treeref;
 	refcount_t		fib_clntref;
 	int			fib_dead;
 	unsigned int		fib_flags;
diff --git a/include/net/ip_fib.h b/include/net/ip_fib.h
index 3ab2563b1a23..21c5386d4a6d 100644
--- a/include/net/ip_fib.h
+++ b/include/net/ip_fib.h
@@ -133,7 +133,7 @@ struct fib_info {
 	struct hlist_node	fib_lhash;
 	struct list_head	nh_list;
 	struct net		*fib_net;
-	int			fib_treeref;
+	refcount_t		fib_treeref;
 	refcount_t		fib_clntref;
 	unsigned int		fib_flags;
 	unsigned char		fib_dead;
diff --git a/net/decnet/dn_fib.c b/net/decnet/dn_fib.c
index 77fbf8e9df4b..387a7e81dd00 100644
--- a/net/decnet/dn_fib.c
+++ b/net/decnet/dn_fib.c
@@ -102,7 +102,7 @@ void dn_fib_free_info(struct dn_fib_info *fi)
 void dn_fib_release_info(struct dn_fib_info *fi)
 {
 	spin_lock(&dn_fib_info_lock);
-	if (fi && --fi->fib_treeref == 0) {
+	if (fi && refcount_dec_and_test(&fi->fib_treeref)) {
 		if (fi->fib_next)
 			fi->fib_next->fib_prev = fi->fib_prev;
 		if (fi->fib_prev)
@@ -385,11 +385,11 @@ struct dn_fib_info *dn_fib_create_info(const struct rtmsg *r, struct nlattr *att
 	if ((ofi = dn_fib_find_info(fi)) != NULL) {
 		fi->fib_dead = 1;
 		dn_fib_free_info(fi);
-		ofi->fib_treeref++;
+		refcount_inc(&ofi->fib_treeref);
 		return ofi;
 	}
 
-	fi->fib_treeref++;
+	refcount_inc(&fi->fib_treeref);
 	refcount_set(&fi->fib_clntref, 1);
 	spin_lock(&dn_fib_info_lock);
 	fi->fib_next = dn_fib_info_list;
diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
index 4c0c33e4710d..fa19f4cdf3a4 100644
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c
@@ -260,7 +260,7 @@ EXPORT_SYMBOL_GPL(free_fib_info);
 void fib_release_info(struct fib_info *fi)
 {
 	spin_lock_bh(&fib_info_lock);
-	if (fi && --fi->fib_treeref == 0) {
+	if (fi && refcount_dec_and_test(&fi->fib_treeref)) {
 		hlist_del(&fi->fib_hash);
 		if (fi->fib_prefsrc)
 			hlist_del(&fi->fib_lhash);
@@ -1373,7 +1373,7 @@ struct fib_info *fib_create_info(struct fib_config *cfg,
 		if (!cfg->fc_mx) {
 			fi = fib_find_info_nh(net, cfg);
 			if (fi) {
-				fi->fib_treeref++;
+				refcount_inc(&fi->fib_treeref);
 				return fi;
 			}
 		}
@@ -1547,11 +1547,11 @@ struct fib_info *fib_create_info(struct fib_config *cfg,
 	if (ofi) {
 		fi->fib_dead = 1;
 		free_fib_info(fi);
-		ofi->fib_treeref++;
+		refcount_inc(&ofi->fib_treeref);
 		return ofi;
 	}
 
-	fi->fib_treeref++;
+	refcount_inc(&fi->fib_treeref);
 	refcount_set(&fi->fib_clntref, 1);
 	spin_lock_bh(&fib_info_lock);
 	hlist_add_head(&fi->fib_hash,
-- 
2.32.0


             reply	other threads:[~2021-07-29  7:14 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-29  7:13 Yajun Deng [this message]
2021-07-29 14:55 ` David Ahern
2021-07-30 15:30 ` patchwork-bot+netdevbpf
2021-08-02 13:37 ` Ioana Ciornei
2021-08-02 14:36   ` David Ahern
2021-08-02 14:59     ` Ioana Ciornei
2021-08-03 11:17   ` Fwd: " yajun.deng
2021-08-03 11:24     ` Marek Szyprowski
     [not found] ` <CGME20210803110803eucas1p276a0010caad8fc21a7ea5ca5543294f8@eucas1p2.samsung.com>
2021-08-03 11:08   ` Marek Szyprowski
2021-08-03 14:43     ` David Ahern

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210729071350.28919-1-yajun.deng@linux.dev \
    --to=yajun.deng@linux.dev \
    --cc=davem@davemloft.net \
    --cc=dsahern@kernel.org \
    --cc=kuba@kernel.org \
    --cc=linux-decnet-user@lists.sourceforge.net \
    --cc=linux-kernel@vger.kernel.org \
    --cc=netdev@vger.kernel.org \
    --cc=yoshfuji@linux-ipv6.org \
    --subject='Re: [PATCH] net: convert fib_treeref from int to refcount_t' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
on how to clone and mirror all data and code used for this inbox