From: jon ernst <jonernst07@gmail.com>
Date: Fri, 18 Apr 2014 15:50:35 +0000 (-0400)
Subject: ext4: enforce we are operating on a regular file in ext4_zero_range()
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=6c5e73d3a26b73bfcac0b4a932cb918177d067f2;p=deliverable%2Flinux.git

ext4: enforce we are operating on a regular file in ext4_zero_range()

Signed-off-by: Jon Ernst <jonernst07@gmail.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
---

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index d0860f2d36d0..2f49b12a4c40 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -4741,6 +4741,9 @@ static long ext4_zero_range(struct file *file, loff_t offset,
 
 	trace_ext4_zero_range(inode, offset, len, mode);
 
+	if (!S_ISREG(inode->i_mode))
+		return -EINVAL;
+
 	/*
 	 * Write out all dirty pages to avoid race conditions
 	 * Then release them.