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>

1 files changed, 3 insertions, 0 deletions

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.