diff options
| author | Herbert Xu <herbert@gondor.apana.org.au> | 2015-03-24 09:53:17 +1100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-03-23 22:16:07 -0400 |
| commit | ba7c95ea3870fe7b847466d39a049ab6f156aa2c (patch) | |
| tree | 8fed9deb6a4a0c1f52634ff0bd07fb6a0edb8dde /include/linux/rhashtable.h | |
| parent | ce046c568cbfb4734583131086f88cfe993c01d0 (diff) | |
rhashtable: Fix sleeping inside RCU critical section in walk_stop
The commit 963ecbd41a1026d99ec7537c050867428c397b89 ("rhashtable:
Fix use-after-free in rhashtable_walk_stop") fixed a real bug
but created another one because we may end up sleeping inside an
RCU critical section.
This patch fixes it properly by replacing the mutex with a spin
lock that specifically protects the walker lists.
Reported-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/rhashtable.h')
| -rw-r--r-- | include/linux/rhashtable.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/rhashtable.h b/include/linux/rhashtable.h index f9ecf32bce55..d7be9cb0e91f 100644 --- a/include/linux/rhashtable.h +++ b/include/linux/rhashtable.h @@ -133,6 +133,7 @@ struct rhashtable_params { * @p: Configuration parameters * @run_work: Deferred worker to expand/shrink asynchronously * @mutex: Mutex to protect current/future table swapping + * @lock: Spin lock to protect walker list * @being_destroyed: True if table is set up for destruction */ struct rhashtable { @@ -144,6 +145,7 @@ struct rhashtable { struct rhashtable_params p; struct work_struct run_work; struct mutex mutex; + spinlock_t lock; }; /** |