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authorDan Carpenter <dan.carpenter@oracle.com>2017-04-14 22:11:53 +0300
committerMike Marshall <hubcap@omnibond.com>2017-04-26 21:33:01 +0300
commit907bfcd8d8a616ca794ba187f6bf1b0e12b3a8dd (patch)
tree482e24eb60a07687094903cf17af88645f3a2fca /fs/orangefs
parentb5a9d61eebdd0016ccb383b25a5c3d04977a6549 (diff)
downloadlinux-907bfcd8d8a616ca794ba187f6bf1b0e12b3a8dd.tar.xz
orangefs: handle zero size write in debugfs
If we write zero bytes to this debugfs file, then it will cause an underflow when we do copy_from_user(buf, ubuf, count - 1). Debugfs can normally only be written to by root so the impact of this is low. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Mike Marshall <hubcap@omnibond.com>
Diffstat (limited to 'fs/orangefs')
-rw-r--r--fs/orangefs/orangefs-debugfs.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/orangefs/orangefs-debugfs.c b/fs/orangefs/orangefs-debugfs.c
index 791912da97d7..716ed337f166 100644
--- a/fs/orangefs/orangefs-debugfs.c
+++ b/fs/orangefs/orangefs-debugfs.c
@@ -440,6 +440,9 @@ static ssize_t orangefs_debug_write(struct file *file,
"orangefs_debug_write: %pD\n",
file);
+ if (count == 0)
+ return 0;
+
/*
* Thwart users who try to jamb a ridiculous number
* of bytes into the debug file...