Patchwork [014/106] lockd: protect nlm_blocked access in nlmsvc_retry_blocked

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Submitter Luis Henriques
Date July 30, 2013, 9:30 a.m.
Message ID <>
Download mbox | patch
Permalink /patch/263344/
State New
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Luis Henriques - July 30, 2013, 9:30 a.m. -stable review patch.  If anyone has any objections, please let me know.


From: David Jeffery <>

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".

Cc: Bryan Schumaker <>
Signed-off-by: David Jeffery <>
Signed-off-by: J. Bruce Fields <>
Signed-off-by: Luis Henriques <>
 fs/lockd/svclock.c | 4 ++++
 1 file changed, 4 insertions(+)


diff --git a/fs/lockd/svclock.c b/fs/lockd/svclock.c
index e46353f..aff1c61 100644
--- a/fs/lockd/svclock.c
+++ b/fs/lockd/svclock.c
@@ -941,6 +941,7 @@  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);
@@ -950,6 +951,7 @@  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);
@@ -959,7 +961,9 @@  nlmsvc_retry_blocked(void)
 		} else
+		spin_lock(&nlm_blocked_lock);
+	spin_unlock(&nlm_blocked_lock);
 	return timeout;