cifs: Fix check for regular file in couldbe_mf_symlink()
MF Symlinks are regular files containing content in a specified format.
The function couldbe_mf_symlink() checks the mode for a set S_IFREG bit
as a test to confirm that it is a regular file. This bit is also set for
other filetypes and simply checking for this bit being set may return
false positives.
We ensure that we are actually checking for a regular file by using the
S_ISREG macro to test instead.
Signed-off-by: Sachin Prabhu <sprabhu@redhat.com>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Reported-by: Neil Brown <neilb@suse.de>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Steve French <smfrench@gmail.com>
diff --git a/fs/cifs/link.c b/fs/cifs/link.c
index 52f41f9..264ece7 100644
--- a/fs/cifs/link.c
+++ b/fs/cifs/link.c
@@ -185,7 +185,7 @@
bool
couldbe_mf_symlink(const struct cifs_fattr *fattr)
{
- if (!(fattr->cf_mode & S_IFREG))
+ if (!S_ISREG(fattr->cf_mode))
/* it's not a symlink */
return false;
