This patch fixes the missing rcu_read_(un)lock in the ipc code Signed-off-by: Nadia Derbey --- ipc/util.c | 3 ++- ipc/util.h | 4 +++- 2 files changed, 5 insertions(+), 2 deletions(-) Index: linux-2.6.23-rc6-mm1/ipc/util.c =================================================================== --- linux-2.6.23-rc6-mm1.orig/ipc/util.c 2007-09-18 16:39:43.000000000 +0200 +++ linux-2.6.23-rc6-mm1/ipc/util.c 2007-09-18 16:40:53.000000000 +0200 @@ -295,6 +295,7 @@ int ipc_addid(struct ipc_ids* ids, struc spin_lock_init(&new->lock); new->deleted = 0; + rcu_read_lock(); spin_lock(&new->lock); return id; } @@ -690,7 +691,7 @@ struct kern_ipc_perm *ipc_lock(struct ip rcu_read_unlock(); return ERR_PTR(-EINVAL); } - rcu_read_unlock(); + return out; } Index: linux-2.6.23-rc6-mm1/ipc/util.h =================================================================== --- linux-2.6.23-rc6-mm1.orig/ipc/util.h 2007-09-18 14:55:31.000000000 +0200 +++ linux-2.6.23-rc6-mm1/ipc/util.h 2007-09-18 16:41:37.000000000 +0200 @@ -141,12 +141,14 @@ static inline int ipc_checkid(struct ipc static inline void ipc_lock_by_ptr(struct kern_ipc_perm *perm) { + rcu_read_lock(); spin_lock(&perm->lock); } static inline void ipc_unlock(struct kern_ipc_perm *perm) { spin_unlock(&perm->lock); + rcu_read_unlock(); } static inline struct kern_ipc_perm *ipc_lock_check(struct ipc_ids *ids, @@ -159,7 +161,7 @@ static inline struct kern_ipc_perm *ipc_ return out; if (ipc_checkid(ids, out, id)) { - spin_unlock(&out->lock); + ipc_unlock(out); return ERR_PTR(-EIDRM); }