diff options
authorDavid Jeffery <>2013-07-10 13:19:50 -0400
committerGreg Kroah-Hartman <>2013-07-28 16:30:22 -0700
commitc4d98e2535e0269fcd513cbb79e937ef3ccc3d01 (patch)
parent61eeaa1b66e47443f27f4cf0809940fbe08142f8 (diff)
lockd: protect nlm_blocked access in nlmsvc_retry_blocked
commit 1c327d962fc420aea046c16215a552710bde8231 upstream. In nlmsvc_retry_blocked, the check that the list is non-empty and acquiring the pointer of the first entry is unprotected by any lock. This allows a rare race condition when there is only one entry on the list. A function such as nlmsvc_grant_callback() can be called, which will temporarily remove the entry from the list. Between the list_empty() and list_entry(),the list may become empty, causing an invalid pointer to be used as an nlm_block, leading to a possible crash. This patch adds the nlm_block_lock around these calls to prevent concurrent use of the nlm_blocked list. This was a regression introduced by f904be9cc77f361d37d71468b13ff3d1a1823dea "lockd: Mostly remove BKL from the server". Signed-off-by: David Jeffery <> Cc: Bryan Schumaker <> Signed-off-by: J. Bruce Fields <> Signed-off-by: Greg Kroah-Hartman <>
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/lockd/svclock.c b/fs/lockd/svclock.c
index e703318c41df..8ebd3f551e0c 100644
--- a/fs/lockd/svclock.c
+++ b/fs/lockd/svclock.c
@@ -939,6 +939,7 @@ nlmsvc_retry_blocked(void)
unsigned long timeout = MAX_SCHEDULE_TIMEOUT;
struct nlm_block *block;
+ spin_lock(&nlm_blocked_lock);
while (!list_empty(&nlm_blocked) && !kthread_should_stop()) {
block = list_entry(, struct nlm_block, b_list);
@@ -948,6 +949,7 @@ nlmsvc_retry_blocked(void)
timeout = block->b_when - jiffies;
+ spin_unlock(&nlm_blocked_lock);
dprintk("nlmsvc_retry_blocked(%p, when=%ld)\n",
block, block->b_when);
@@ -957,7 +959,9 @@ nlmsvc_retry_blocked(void)
} else
+ spin_lock(&nlm_blocked_lock);
+ spin_unlock(&nlm_blocked_lock);
return timeout;