From: GwanYeong Kim gy741.kim@gmail.com
[ Upstream commit 28df0642abbf6d66908a2858922a7e4b21cdd8c2 ]
This isn't really accurate right. fread() doesn't always return 0 in error. It could return < number of elements and set errno.
Signed-off-by: GwanYeong Kim gy741.kim@gmail.com Acked-by: Shuah Khan skhan@linuxfoundation.org Link: https://lore.kernel.org/r/20191018032223.4644-1-gy741.kim@gmail.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- tools/usb/usbip/libsrc/usbip_device_driver.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/tools/usb/usbip/libsrc/usbip_device_driver.c b/tools/usb/usbip/libsrc/usbip_device_driver.c index ec3a0b794f159..67ae6c1557b8c 100644 --- a/tools/usb/usbip/libsrc/usbip_device_driver.c +++ b/tools/usb/usbip/libsrc/usbip_device_driver.c @@ -81,7 +81,7 @@ int read_usb_vudc_device(struct udev_device *sdev, struct usbip_usb_device *dev) FILE *fd = NULL; struct udev_device *plat; const char *speed; - int ret = 0; + size_t ret;
plat = udev_device_get_parent(sdev); path = udev_device_get_syspath(plat); @@ -91,8 +91,10 @@ int read_usb_vudc_device(struct udev_device *sdev, struct usbip_usb_device *dev) if (!fd) return -1; ret = fread((char *) &descr, sizeof(descr), 1, fd); - if (ret < 0) + if (ret != 1) { + err("Cannot read vudc device descr file: %s", strerror(errno)); goto err; + } fclose(fd);
copy_descr_attr(dev, &descr, bDeviceClass);