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Date: Thu, 29 Jul 2021 15:13:50 +0800
From: Yajun Deng <yajun.deng@...ux.dev>
To: davem@...emloft.net, kuba@...nel.org, yoshfuji@...ux-ipv6.org,
dsahern@...nel.org
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-decnet-user@...ts.sourceforge.net,
Yajun Deng <yajun.deng@...ux.dev>
Subject: [PATCH] net: convert fib_treeref from int to refcount_t
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@...ux.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
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