After commit d202cce8963d expired cache_head can be removed from
hash on cache_detail.
However expired cache_head can wait for reply from previously submitted
request. Such cache_head have increased refcounter and therefore it
cannot be freed after cache_put(freeme).
Because cache_head was removed from hash it cannot be found during
cache_clean() and can be leaked forever together with stalled cache_request
and other taken resources.
Fixes d202cce8963d ("sunrpc: never return expired entries in sunrpc_cache_lookup")
Cc: Pavel Tikhomirov <ptikhomirov@xxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxx # 2.6.35
Signed-off-by: Vasily Averin <vvs@xxxxxxxxxxxxx>
---
net/sunrpc/cache.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c
index 109fbe591e7b..483a5cfd60f0 100644
--- a/net/sunrpc/cache.c
+++ b/net/sunrpc/cache.c
@@ -54,6 +54,11 @@ static void cache_init(struct cache_head *h, struct cache_detail *detail)
h->last_refresh = now;
}
+static void cache_fresh_locked(struct cache_head *head, time_t expiry,
+ struct cache_detail *detail);
+static void cache_fresh_unlocked(struct cache_head *head,
+ struct cache_detail *detail);
+
struct cache_head *sunrpc_cache_lookup(struct cache_detail *detail,
struct cache_head *key, int hash)
{
@@ -95,6 +100,7 @@ struct cache_head *sunrpc_cache_lookup(struct cache_detail *detail,
if (cache_is_expired(detail, tmp)) {
hlist_del_init(&tmp->cache_list);
detail->entries --;
+ cache_fresh_locked(tmp, 0, detail);
freeme = tmp;
break;
}
@@ -110,8 +116,10 @@ struct cache_head *sunrpc_cache_lookup(struct cache_detail *detail,
cache_get(new);
write_unlock(&detail->hash_lock);
- if (freeme)
+ if (freeme) {
+ cache_fresh_unlocked(freeme, detail);
cache_put(freeme, detail);
+ }
return new;
}
EXPORT_SYMBOL_GPL(sunrpc_cache_lookup);
--
2.17.1
