From 3de4e20568171f542adb8d54a47c46ff025ca942 Mon Sep 17 00:00:00 2001 From: Michal Nazarewicz Date: Mon, 4 Jan 2016 20:42:43 +0100 Subject: [PATCH] usb: f_fs: fix memory leak when ep changes during transfer MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit In the ffs_epfile_io function, data buffer is allocated for non-halt requests. Later, after grabing a mutex, the function checks that epfile->ep is still ep and if it’s not, it set ret to -ESHUTDOWN and follow a path including spin_unlock_irq (just after ‘ret = -ESHUTDOWN’), mutex_unlock (after if-else-if-else chain) and returns ret. Noticeably, this does not include freeing of the data buffer. Fix by introducing a goto which moves control flow to the the end of the function where spin_unlock_irq, mutex_unlock and kfree are all called. Signed-off-by: Michal Nazarewicz Signed-off-by: Felipe Balbi --- drivers/usb/gadget/function/f_fs.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c index cf43e9e..d1a4a86 100644 --- a/drivers/usb/gadget/function/f_fs.c +++ b/drivers/usb/gadget/function/f_fs.c @@ -763,7 +763,7 @@ static ssize_t ffs_epfile_io(struct file *file, struct ffs_io_data *io_data) if (epfile->ep != ep) { /* In the meantime, endpoint got disabled or changed. */ ret = -ESHUTDOWN; - spin_unlock_irq(&epfile->ffs->eps_lock); + goto error_lock; } else if (halt) { /* Halt */ if (likely(epfile->ep == ep) && !WARN_ON(!ep->ep)) -- 2.7.4