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| author | Johan Hovold <jhovold@gmail.com> | 2011-03-22 11:12:11 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-03-27 12:00:30 -0700 |
| commit | b38678ba236c9af5404c820e2052ba44656a6d4a (patch) | |
| tree | da0afbfd3e87ce4440fd92b9520b6cd9cbe9bd7b | |
| parent | 28f52cce445e2191f7474a2eda54eec5895334c9 (diff) | |
| download | linux-stable-b38678ba236c9af5404c820e2052ba44656a6d4a.tar.gz linux-stable-b38678ba236c9af5404c820e2052ba44656a6d4a.tar.bz2 linux-stable-b38678ba236c9af5404c820e2052ba44656a6d4a.zip | |
USB: cdc-acm: fix potential null-pointer dereference on disconnect
commit 7e7797e7f6f7bfab73fca02c65e40eaa5bb9000c upstream.
Fix potential null-pointer exception on disconnect introduced by commit
11ea859d64b69a747d6b060b9ed1520eab1161fe (USB: additional power savings
for cdc-acm devices that support remote wakeup).
Only access acm->dev after making sure it is non-null in control urb
completion handler.
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/usb/class/cdc-acm.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c index fcdd41e0429b..30bb8d053c2e 100644 --- a/drivers/usb/class/cdc-acm.c +++ b/drivers/usb/class/cdc-acm.c @@ -297,6 +297,8 @@ static void acm_ctrl_irq(struct urb *urb) if (!ACM_READY(acm)) goto exit; + usb_mark_last_busy(acm->dev); + data = (unsigned char *)(dr + 1); switch (dr->bNotificationType) { case USB_CDC_NOTIFY_NETWORK_CONNECTION: @@ -336,7 +338,6 @@ static void acm_ctrl_irq(struct urb *urb) break; } exit: - usb_mark_last_busy(acm->dev); retval = usb_submit_urb(urb, GFP_ATOMIC); if (retval) dev_err(&urb->dev->dev, "%s - usb_submit_urb failed with " |