Commit a9a315d4 authored Jan 31, 2014 by Sachin Prabhu Committed by Steve French Jan 31, 2014

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>

parent 666753c3

fs/cifs/link.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -185,7 +185,7 @@ format_mf_symlink(u8 buf, unsigned int buf_len, const char link_str)
		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;