From: Jeff Layton <jlayton@xxxxxxxxxx>
Currently the two are unioned together, but I don't think that's safe.
It looks like get_cached_acl could race with the last put in
posix_acl_release. get_cached_acl calls atomic_inc_not_zero on
a_refcount, but that field could have already been clobbered by
call_rcu, and may no longer be zero. Fix this by de-unioning the two
fields.
Fixes: b8a7a3a66747 (v4.7-rc1, posix_acl: Inode acl caching fixes)
Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx>
Acked-by: David Howells <dhowells@xxxxxxxxxx>
Signed-off-by: Andreas Gruenbacher <agruenba@xxxxxxxxxx>
---
include/linux/posix_acl.h | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/include/linux/posix_acl.h b/include/linux/posix_acl.h
index 5b5a80c..c818772 100644
--- a/include/linux/posix_acl.h
+++ b/include/linux/posix_acl.h
@@ -43,10 +43,8 @@ struct posix_acl_entry {
};
struct posix_acl {
- union {
- atomic_t a_refcount;
- struct rcu_head a_rcu;
- };
+ atomic_t a_refcount;
+ struct rcu_head a_rcu;
unsigned int a_count;
struct posix_acl_entry a_entries[0];
};
--
2.5.5
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