From: Udipto Goswami quic_ugoswami@quicinc.com
[ Upstream commit 921deb9da15851425ccbb6ee409dc2fd8fbdfe6b ]
__ffs_ep0_queue_wait executes holding the spinlock of &ffs->ev.waitq.lock and unlocks it after the assignments to usb_request are done. However in the code if the request is already NULL we bail out returning -EINVAL but never unlocked the spinlock.
Fix this by adding spin_unlock_irq &ffs->ev.waitq.lock before returning.
Fixes: 6a19da111057 ("usb: gadget: f_fs: Prevent race during ffs_ep0_queue_wait") Reviewed-by: John Keeping john@metanate.com Signed-off-by: Udipto Goswami quic_ugoswami@quicinc.com Link: https://lore.kernel.org/r/20230124091149.18647-1-quic_ugoswami@quicinc.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/usb/gadget/function/f_fs.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c index 94000fd190e5..8c48c9f801be 100644 --- a/drivers/usb/gadget/function/f_fs.c +++ b/drivers/usb/gadget/function/f_fs.c @@ -278,8 +278,10 @@ static int __ffs_ep0_queue_wait(struct ffs_data *ffs, char *data, size_t len) struct usb_request *req = ffs->ep0req; int ret;
- if (!req) + if (!req) { + spin_unlock_irq(&ffs->ev.waitq.lock); return -EINVAL; + }
req->zero = len < le16_to_cpu(ffs->ev.setup.wLength);