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Subject[PATCH 3.12 115/142] USB: fix linked-list corruption in rh_call_control()
Date
From: Alan Stern <stern@rowland.harvard.edu>

3.12-stable review patch. If anyone has any objections, please let me know.

===============

commit 1633682053a7ee8058e10c76722b9b28e97fb73f 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: Jiri Slaby <jslaby@suse.cz>
---
drivers/usb/core/hcd.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index 79055b3df45a..9925e4b6e2d3 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -498,8 +498,10 @@ 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;

@@ -702,6 +704,7 @@ error:
}

kfree(tbuf);
+ err_alloc:

/* any errors get returned through the urb completion */
spin_lock_irq(&hcd_root_hub_lock);
--
2.12.2
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