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authorDavid Woodhouse <dwmw2@infradead.org>2007-07-07 14:58:39 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-07 12:22:37 -0700
commit1c39858b5dd46004b12c5acd26d8df346bef8a10 (patch)
treec81d53cad2d1e4cd56f05c305340f9ba056fb801
parentd23cf676d0e9d1fdc066d2dcb7f8bc0e2d4c75bd (diff)
downloadlinux-stericsson-1c39858b5dd46004b12c5acd26d8df346bef8a10.tar.gz
Fix use-after-free oops in Bluetooth HID.
When cleaning up HIDP sessions, we currently close the ACL connection before deregistering the input device. Closing the ACL connection schedules a workqueue to remove the associated objects from sysfs, but the input device still refers to them -- and if the workqueue happens to run before the input device removal, the kernel will oops when trying to look up PHYSDEVPATH for the removed input device. Fix this by deregistering the input device before closing the connections. Signed-off-by: David Woodhouse <dwmw2@infradead.org> Acked-by: Marcel Holtmann <marcel@holtmann.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--net/bluetooth/hidp/core.c18
1 files changed, 9 insertions, 9 deletions
diff --git a/net/bluetooth/hidp/core.c b/net/bluetooth/hidp/core.c
index ceadfcf457c1..450eb0244bbf 100644
--- a/net/bluetooth/hidp/core.c
+++ b/net/bluetooth/hidp/core.c
@@ -581,15 +581,6 @@ static int hidp_session(void *arg)
hidp_del_timer(session);
- fput(session->intr_sock->file);
-
- wait_event_timeout(*(ctrl_sk->sk_sleep),
- (ctrl_sk->sk_state == BT_CLOSED), msecs_to_jiffies(500));
-
- fput(session->ctrl_sock->file);
-
- __hidp_unlink_session(session);
-
if (session->input) {
input_unregister_device(session->input);
session->input = NULL;
@@ -601,6 +592,15 @@ static int hidp_session(void *arg)
hid_free_device(session->hid);
}
+ fput(session->intr_sock->file);
+
+ wait_event_timeout(*(ctrl_sk->sk_sleep),
+ (ctrl_sk->sk_state == BT_CLOSED), msecs_to_jiffies(500));
+
+ fput(session->ctrl_sock->file);
+
+ __hidp_unlink_session(session);
+
up_write(&hidp_session_sem);
kfree(session);