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| author | David Howells <dhowells@redhat.com> | 2018-10-20 00:57:59 +0100 |
|---|---|---|
| committer | David Howells <dhowells@redhat.com> | 2018-10-24 00:41:09 +0100 |
| commit | 18ac61853cc4e44eb30e125fc8344a3b25c7b6fe (patch) | |
| tree | 9565bfd8b0dec553d351ca13ce841a5e2bbeae7a /fs/afs/security.c | |
| parent | 2feeaf8433c8e68de3d0a06a0ffe7742bcd13c1a (diff) | |
| download | linux-18ac61853cc4e44eb30e125fc8344a3b25c7b6fe.tar.gz linux-18ac61853cc4e44eb30e125fc8344a3b25c7b6fe.tar.bz2 linux-18ac61853cc4e44eb30e125fc8344a3b25c7b6fe.zip | |
afs: Fix callback handling
In some circumstances, the callback interest pointer is NULL, so in such a
case we can't dereference it when checking to see if the callback is
broken. This causes an oops in some circumstances.
Fix this by replacing the function that worked out the aggregate break
counter with one that actually does the comparison, and then make that
return true (ie. broken) if there is no callback interest as yet (ie. the
pointer is NULL).
Fixes: 68251f0a6818 ("afs: Fix whole-volume callback handling")
Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'fs/afs/security.c')
| -rw-r--r-- | fs/afs/security.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/fs/afs/security.c b/fs/afs/security.c index d1ae53fd3739..5f58a9a17e69 100644 --- a/fs/afs/security.c +++ b/fs/afs/security.c @@ -147,7 +147,8 @@ void afs_cache_permit(struct afs_vnode *vnode, struct key *key, break; } - if (cb_break != afs_cb_break_sum(vnode, vnode->cb_interest)) { + if (afs_cb_is_broken(cb_break, vnode, + vnode->cb_interest)) { changed = true; break; } @@ -177,7 +178,7 @@ void afs_cache_permit(struct afs_vnode *vnode, struct key *key, } } - if (cb_break != afs_cb_break_sum(vnode, vnode->cb_interest)) + if (afs_cb_is_broken(cb_break, vnode, vnode->cb_interest)) goto someone_else_changed_it; /* We need a ref on any permits list we want to copy as we'll have to @@ -256,7 +257,7 @@ found: spin_lock(&vnode->lock); zap = rcu_access_pointer(vnode->permit_cache); - if (cb_break == afs_cb_break_sum(vnode, vnode->cb_interest) && + if (!afs_cb_is_broken(cb_break, vnode, vnode->cb_interest) && zap == permits) rcu_assign_pointer(vnode->permit_cache, replacement); else |