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authorDavid Howells <dhowells@redhat.com>2018-02-06 06:26:30 +0000
committerDavid Howells <dhowells@redhat.com>2018-02-06 14:36:54 +0000
commitfe4d774c847398c2a45c10a780ccfde069840793 (patch)
tree80e685497ff9e9a7b703e8f9f6cef8c5b80e8946 /fs/afs
parente44150157f42219fa5c074588efdb31ccfb197fc (diff)
afs: Fix missing cursor clearance
afs_select_fileserver() ends the address cursor it is using in the case in which we get some sort of network error and run out of addresses to iterate through, before it jumps to try the next server. This also needs to be done when the server aborts with some sort of error that means we should try the next server. Fix this by: (1) Move the iterate_address afs_end_cursor() call to the next_server case. (2) End the cursor in the failed case. (3) Make afs_end_cursor() clear the ->begun flag and ->addr pointer in the address cursor. (4) Make afs_end_cursor() able to be called on an already cleared cursor. Without this, something like the following oops may occur: AFS: Assertion failed 18446612134397189888 == 0 is false 0xffff88007c279f00 == 0x0 is false ------------[ cut here ]------------ kernel BUG at fs/afs/rotate.c:360! RIP: 0010:afs_select_fileserver+0x79b/0xa30 [kafs] Call Trace: afs_statfs+0xcc/0x180 [kafs] ? p9_client_statfs+0x9e/0x110 [9pnet] ? _cond_resched+0x19/0x40 statfs_by_dentry+0x6d/0x90 vfs_statfs+0x1b/0xc0 user_statfs+0x4b/0x80 SYSC_statfs+0x15/0x30 SyS_statfs+0xe/0x10 entry_SYSCALL_64_fastpath+0x20/0x83 Fixes: d2ddc776a458 ("afs: Overhaul volume and server record caching and fileserver rotation") Reported-by: Marc Dionne <marc.dionne@auristor.com> Signed-off-by: David Howells <dhowells@redhat.com> cc: stable@vger.kernel.org
Diffstat (limited to 'fs/afs')
-rw-r--r--fs/afs/addr_list.c13
-rw-r--r--fs/afs/rotate.c12
2 files changed, 16 insertions, 9 deletions
diff --git a/fs/afs/addr_list.c b/fs/afs/addr_list.c
index a537368ba0db..fd9f28b8a933 100644
--- a/fs/afs/addr_list.c
+++ b/fs/afs/addr_list.c
@@ -332,11 +332,18 @@ bool afs_iterate_addresses(struct afs_addr_cursor *ac)
*/
int afs_end_cursor(struct afs_addr_cursor *ac)
{
- if (ac->responded && ac->index != ac->start)
- WRITE_ONCE(ac->alist->index, ac->index);
+ struct afs_addr_list *alist;
+
+ alist = ac->alist;
+ if (alist) {
+ if (ac->responded && ac->index != ac->start)
+ WRITE_ONCE(alist->index, ac->index);
+ afs_put_addrlist(alist);
+ }
- afs_put_addrlist(ac->alist);
+ ac->addr = NULL;
ac->alist = NULL;
+ ac->begun = false;
return ac->error;
}
diff --git a/fs/afs/rotate.c b/fs/afs/rotate.c
index d04511fb3879..b473b25c6978 100644
--- a/fs/afs/rotate.c
+++ b/fs/afs/rotate.c
@@ -334,6 +334,7 @@ start:
next_server:
_debug("next");
+ afs_end_cursor(&fc->ac);
afs_put_cb_interest(afs_v2net(vnode), fc->cbi);
fc->cbi = NULL;
fc->index++;
@@ -410,16 +411,15 @@ iterate_address:
/* Iterate over the current server's address list to try and find an
* address on which it will respond to us.
*/
- if (afs_iterate_addresses(&fc->ac)) {
- _leave(" = t");
- return true;
- }
+ if (!afs_iterate_addresses(&fc->ac))
+ goto next_server;
- afs_end_cursor(&fc->ac);
- goto next_server;
+ _leave(" = t");
+ return true;
failed:
fc->flags |= AFS_FS_CURSOR_STOP;
+ afs_end_cursor(&fc->ac);
_leave(" = f [failed %d]", fc->ac.error);
return false;
}