[PATCH 7/9 linux-next] fanotify: don't write with zero size

[Fabian Frederick <fabf@xxxxxxxxx>]

check count in fanotify_write() and return -EINVAL when 0

Signed-off-by: Fabian Frederick <fabf@xxxxxxxxx>
---
 fs/notify/fanotify/fanotify_user.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
index 02a314acc757..6e19dacb2475 100644
--- a/fs/notify/fanotify/fanotify_user.c
+++ b/fs/notify/fanotify/fanotify_user.c
@@ -485,6 +485,9 @@ static ssize_t fanotify_write(struct file *file, const char __user *buf, size_t
 	if (!IS_ENABLED(CONFIG_FANOTIFY_ACCESS_PERMISSIONS))
 		return -EINVAL;
 
+	if (!count)
+		return -EINVAL;
+
 	group = file->private_data;
 
 	if (count > sizeof(response))
-- 
2.26.2