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| author |   David Howells <dhowells@redhat.com> | 2019-10-07 10:58:29 +0100 |
|---|---|---|
| committer | David Howells <dhowells@redhat.com> | 2019-10-07 11:05:05 +0100 |
| commit | 91fcfbe8852edb929ff8702534525031a15d0aa6 (patch) | |
| tree | b2e93c89b0e500684338283cb37b22bfb4f34d95 /net/rxrpc/ar-internal.h | |
| parent | rxrpc: rxrpc_peer needs to hold a ref on the rxrpc_local record (diff) | |
| download | linux-dev-91fcfbe8852edb929ff8702534525031a15d0aa6.tar.xz linux-dev-91fcfbe8852edb929ff8702534525031a15d0aa6.zip | |
rxrpc: Fix call crypto state cleanup
Fix the cleanup of the crypto state on a call after the call has been
disconnected. As the call has been disconnected, its connection ref has
been discarded and so we can't go through that to get to the security ops
table.
Fix this by caching the security ops pointer in the rxrpc_call struct and
using that when freeing the call security state. Also use this in other
places we're dealing with call-specific security.
The symptoms look like:
BUG: KASAN: use-after-free in rxrpc_release_call+0xb2d/0xb60
net/rxrpc/call_object.c:481
Read of size 8 at addr ffff888062ffeb50 by task syz-executor.5/4764
Fixes: 1db88c534371 ("rxrpc: Fix -Wframe-larger-than= warnings from on-stack crypto")
Reported-by: syzbot+eed305768ece6682bb7f@syzkaller.appspotmail.com
Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'net/rxrpc/ar-internal.h')
| -rw-r--r-- | net/rxrpc/ar-internal.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h index 1091bf35a199..ecc17dabec8f 100644 --- a/net/rxrpc/ar-internal.h +++ b/net/rxrpc/ar-internal.h @@ -556,6 +556,7 @@ struct rxrpc_call { struct rxrpc_peer *peer; /* Peer record for remote address */ struct rxrpc_sock __rcu *socket; /* socket responsible */ struct rxrpc_net *rxnet; /* Network namespace to which call belongs */ + const struct rxrpc_security *security; /* applied security module */ struct mutex user_mutex; /* User access mutex */ unsigned long ack_at; /* When deferred ACK needs to happen */ unsigned long ack_lost_at; /* When ACK is figured as lost */ |