4.19-stable review patch. If anyone has any objections, please let me know.
------------------
From: Harshit Mogalapalli <harshit.m.mogalapalli@xxxxxxxxxx>
commit e7d3b9f28654dbfce7e09f8028210489adaf6a33 upstream.
Unlock before returning on the error path.
Fixes: 86b20af11e84 ("usb: yurex: Replace snprintf() with the safer scnprintf() variant")
Reported-by: Dan Carpenter <error27@xxxxxxxxx>
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Closes: https://lore.kernel.org/r/202312170252.3udgrIcP-lkp@xxxxxxxxx/
Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20231219063639.450994-1-harshit.m.mogalapalli@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/misc/yurex.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/usb/misc/yurex.c
+++ b/drivers/usb/misc/yurex.c
@@ -414,8 +414,10 @@ static ssize_t yurex_read(struct file *f
return -ENODEV;
}
- if (WARN_ON_ONCE(dev->bbu > S64_MAX || dev->bbu < S64_MIN))
+ if (WARN_ON_ONCE(dev->bbu > S64_MAX || dev->bbu < S64_MIN)) {
+ mutex_unlock(&dev->io_mutex);
return -EIO;
+ }
spin_lock_irq(&dev->lock);
scnprintf(in_buffer, MAX_S64_STRLEN, "%lld\n", dev->bbu);
