From: GwanYeong Kim <gy741.kim@gmail.com>
Date: Fri, 18 Oct 2019 03:22:23 +0000
Subject: usbip: tools: Fix read_usb_vudc_device() error path handling
Git-commit: 28df0642abbf6d66908a2858922a7e4b21cdd8c2
Patch-mainline: 5.4-rc6
References: bnc#1151927 5.3.11
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: Jiri Slaby <jslaby@suse.cz>
---
tools/usb/usbip/libsrc/usbip_device_driver.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- a/tools/usb/usbip/libsrc/usbip_device_driver.c
+++ b/tools/usb/usbip/libsrc/usbip_device_driver.c
@@ -69,7 +69,7 @@ int read_usb_vudc_device(struct udev_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);
@@ -79,8 +79,10 @@ int read_usb_vudc_device(struct udev_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);