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cifs: Fix check for regular file in couldbe_mf_symlink()

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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>
This commit is contained in:
Sachin Prabhu 2014-01-31 14:27:16 +00:00 committed by Steve French
parent 666753c3ef
commit a9a315d414
1 changed files with 1 additions and 1 deletions
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2
fs/cifs/link.c
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@ -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;