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Message-Id: <1489749179-12063-13-git-send-email-elena.reshetova@intel.com>
Date: Fri, 17 Mar 2017 13:12:53 +0200
From: Elena Reshetova <elena.reshetova@...el.com>
To: netdev@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
linux-decnet-user@...ts.sourceforge.net, davem@...emloft.net,
jmorris@...ei.org, kaber@...sh.net, yoshfuji@...ux-ipv6.org,
kuznet@....inr.ac.ru, 3chas3@...il.com, ralf@...ux-mips.org,
stephen@...workplumber.org, jchapman@...alix.com, jhs@...atatu.com,
bridge@...ts.linux-foundation.org, linux-hams@...r.kernel.org,
linux-x25@...r.kernel.org, linux-bluetooth@...r.kernel.org,
marcel@...tmann.org, johan.hedberg@...il.com, peterz@...radead.org,
keescook@...omium.org, Elena Reshetova <elena.reshetova@...el.com>,
Hans Liljestrand <ishkamiel@...il.com>,
David Windsor <dwindsor@...il.com>
Subject: [PATCH 12/18] net, calipso: convert calipso_doi.refcount 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.
Signed-off-by: Elena Reshetova <elena.reshetova@...el.com>
Signed-off-by: Hans Liljestrand <ishkamiel@...il.com>
Signed-off-by: Kees Cook <keescook@...omium.org>
Signed-off-by: David Windsor <dwindsor@...il.com>
---
include/net/calipso.h | 4 ++--
net/ipv6/calipso.c | 12 ++++++------
2 files changed, 8 insertions(+), 8 deletions(-)
diff --git a/include/net/calipso.h b/include/net/calipso.h
index b1b30cd..5f95b11 100644
--- a/include/net/calipso.h
+++ b/include/net/calipso.h
@@ -38,7 +38,7 @@
#include <linux/skbuff.h>
#include <net/netlabel.h>
#include <net/request_sock.h>
-#include <linux/atomic.h>
+#include <linux/refcount.h>
#include <asm/unaligned.h>
/* known doi values */
@@ -57,7 +57,7 @@ struct calipso_doi {
u32 doi;
u32 type;
- atomic_t refcount;
+ refcount_t refcount;
struct list_head list;
struct rcu_head rcu;
};
diff --git a/net/ipv6/calipso.c b/net/ipv6/calipso.c
index 37ac9de..997611f 100644
--- a/net/ipv6/calipso.c
+++ b/net/ipv6/calipso.c
@@ -338,7 +338,7 @@ static struct calipso_doi *calipso_doi_search(u32 doi)
struct calipso_doi *iter;
list_for_each_entry_rcu(iter, &calipso_doi_list, list)
- if (iter->doi == doi && atomic_read(&iter->refcount))
+ if (iter->doi == doi && refcount_read(&iter->refcount))
return iter;
return NULL;
}
@@ -370,7 +370,7 @@ static int calipso_doi_add(struct calipso_doi *doi_def,
if (doi_def->doi == CALIPSO_DOI_UNKNOWN)
goto doi_add_return;
- atomic_set(&doi_def->refcount, 1);
+ refcount_set(&doi_def->refcount, 1);
spin_lock(&calipso_doi_list_lock);
if (calipso_doi_search(doi_def->doi)) {
@@ -458,7 +458,7 @@ static int calipso_doi_remove(u32 doi, struct netlbl_audit *audit_info)
ret_val = -ENOENT;
goto doi_remove_return;
}
- if (!atomic_dec_and_test(&doi_def->refcount)) {
+ if (!refcount_dec_and_test(&doi_def->refcount)) {
spin_unlock(&calipso_doi_list_lock);
ret_val = -EBUSY;
goto doi_remove_return;
@@ -499,7 +499,7 @@ static struct calipso_doi *calipso_doi_getdef(u32 doi)
doi_def = calipso_doi_search(doi);
if (!doi_def)
goto doi_getdef_return;
- if (!atomic_inc_not_zero(&doi_def->refcount))
+ if (!refcount_inc_not_zero(&doi_def->refcount))
doi_def = NULL;
doi_getdef_return:
@@ -520,7 +520,7 @@ static void calipso_doi_putdef(struct calipso_doi *doi_def)
if (!doi_def)
return;
- if (!atomic_dec_and_test(&doi_def->refcount))
+ if (!refcount_dec_and_test(&doi_def->refcount))
return;
spin_lock(&calipso_doi_list_lock);
list_del_rcu(&doi_def->list);
@@ -553,7 +553,7 @@ static int calipso_doi_walk(u32 *skip_cnt,
rcu_read_lock();
list_for_each_entry_rcu(iter_doi, &calipso_doi_list, list)
- if (atomic_read(&iter_doi->refcount) > 0) {
+ if (refcount_read(&iter_doi->refcount) > 0) {
if (doi_cnt++ < *skip_cnt)
continue;
ret_val = callback(iter_doi, cb_arg);
--
2.7.4
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