| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.19 378/639] afs: Fix double inc of vnode->cb_break | Date | Fri, 24 Jan 2020 10:29:08 +0100 |
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From: David Howells <dhowells@redhat.com>
[ Upstream commit fd711586bb7d63f257da5eff234e68c446ac35ea ]
When __afs_break_callback() clears the CB_PROMISED flag, it increments vnode->cb_break to trigger a future refetch of the status and callback - however it also calls afs_clear_permits(), which also increments vnode->cb_break.
Fix this by removing the increment from afs_clear_permits().
Whilst we're at it, fix the conditional call to afs_put_permits() as the function checks to see if the argument is NULL, so the check is redundant.
Fixes: be080a6f43c4 ("afs: Overhaul permit caching"); Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Sasha Levin <sashal@kernel.org> --- fs/afs/security.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/fs/afs/security.c b/fs/afs/security.c index 81dfedb7879ff..66042b432baa8 100644 --- a/fs/afs/security.c +++ b/fs/afs/security.c @@ -87,11 +87,9 @@ void afs_clear_permits(struct afs_vnode *vnode) permits = rcu_dereference_protected(vnode->permit_cache, lockdep_is_held(&vnode->lock)); RCU_INIT_POINTER(vnode->permit_cache, NULL); - vnode->cb_break++; spin_unlock(&vnode->lock); - if (permits) - afs_put_permits(permits); + afs_put_permits(permits); } /* -- 2.20.1
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