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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@linux.dev>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://lore.kernel.org/r/20210729071350.28919-1-yajun.deng@linux.dev
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Yajun Deng 2021-07-29 15:13:50 +08:00 committed by Jakub Kicinski
parent 3e12361b6d
commit 79976892f7
4 changed files with 9 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/net/dn_fib.h
View File

@ -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;

2
include/net/ip_fib.h
View File

@ -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;

6
net/decnet/dn_fib.c
View File

@ -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 @@ link_it:
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;

8
net/ipv4/fib_semantics.c
View File

@ -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 @@ link_it:
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,