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net: xen-netback: hash.c: Use built-in RCU list checking

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commit f3265971ded98a069ad699b51b8a5ab95e9e5be1 upstream.

list_for_each_entry_rcu has built-in RCU and lock checking.
Pass cond argument to list_for_each_entry_rcu.

Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik04@gmail.com>
Acked-by: Wei Liu <wei.liu@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Stable-dep-of: 0fa5e94a1811 ("net/xen-netback: prevent UAF in xenvif_flush_hash()")
Signed-off-by: Hagar Hemdan <hagarhem@amazon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Madhuparna Bhowmik 2020-01-15 21:25:53 +05:30 • committed by Greg Kroah-Hartman
commit 4b978070c5
1 changed files with 4 additions and 2 deletions
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6
drivers/net/xen-netback/hash.c
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@ -51,7 +51,8 @@ static void xenvif_add_hash(struct xenvif *vif, const u8 *tag,
found = false;
oldest = NULL;
list_for_each_entry_rcu(entry, &vif->hash.cache.list, link) {
list_for_each_entry_rcu(entry, &vif->hash.cache.list, link,
lockdep_is_held(&vif->hash.cache.lock)) {
/* Make sure we don't add duplicate entries */
if (entry->len == len &&
memcmp(entry->tag, tag, len) == 0)
@ -102,7 +103,8 @@ static void xenvif_flush_hash(struct xenvif *vif)
spin_lock_irqsave(&vif->hash.cache.lock, flags);
list_for_each_entry_rcu(entry, &vif->hash.cache.list, link) {
list_for_each_entry_rcu(entry, &vif->hash.cache.list, link,
lockdep_is_held(&vif->hash.cache.lock)) {
list_del_rcu(&entry->link);
vif->hash.cache.count--;
kfree_rcu(entry, rcu);