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USB: fix linked-list corruption in rh_call_control()

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commit 1633682053 upstream.

Using KASAN, Dmitry found a bug in the rh_call_control() routine: If
buffer allocation fails, the routine returns immediately without
unlinking its URB from the control endpoint, eventually leading to
linked-list corruption.

This patch fixes the problem by jumping to the end of the routine
(where the URB is unlinked) when an allocation failure occurs.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Reported-and-tested-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alan Stern
2017-03-24 13:38:28 -04:00
committed by Greg Kroah-Hartman
parent 1f1c9e2965
commit 67e41b1368
1 changed files with 5 additions and 2 deletions
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7
drivers/usb/core/hcd.c
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@@ -520,8 +520,10 @@ static int rh_call_control (struct usb_hcd *hcd, struct urb *urb)
*/
tbuf_size = max_t(u16, sizeof(struct usb_hub_descriptor), wLength);
tbuf = kzalloc(tbuf_size, GFP_KERNEL);
if (!tbuf)
return -ENOMEM;
if (!tbuf) {
status = -ENOMEM;
goto err_alloc;
}
bufp = tbuf;
@@ -734,6 +736,7 @@ error:
}
kfree(tbuf);
err_alloc:
/* any errors get returned through the urb completion */
spin_lock_irq(&hcd_root_hub_lock);