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afs: Use kfree_rcu() instead of casting kfree() to rcu_callback_t

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afs_put_addrlist() casts kfree() to rcu_callback_t. Apart from being wrong
in theory, this might also blow up when people start enforcing function
types via compiler instrumentation, and it means the rcu_head has to be
first in struct afs_addr_list.

Use kfree_rcu() instead, it's simpler and more correct.

Signed-off-by: Jann Horn <jannh@google.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jann Horn 2020-03-12 21:36:53 +00:00 committed by Linus Torvalds
parent 0d81a3f29c
commit ddd2b85ff7
2 changed files with 2 additions and 2 deletions
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2
fs/afs/addr_list.c
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@ -19,7 +19,7 @@
void afs_put_addrlist(struct afs_addr_list *alist)
{
if (alist && refcount_dec_and_test(&alist->usage))
call_rcu(&alist->rcu, (rcu_callback_t)kfree);
kfree_rcu(alist, rcu);
}
/*

2
fs/afs/internal.h
View file

@ -81,7 +81,7 @@ enum afs_call_state {
* List of server addresses.
*/
struct afs_addr_list {
struct rcu_head rcu; /* Must be first */
struct rcu_head rcu;
refcount_t usage;
u32 version; /* Version */
unsigned char max_addrs;