tree 391465f2a1f199a8e5b789faca7556dac3b1ecc9
parent 42bec214d8bd432be6d32a1acb0a9079ecd4d142
author Ronnie Sahlberg <lsahlber@redhat.com> 1503463694 +1000
committer Steve French <smfrench@gmail.com> 1503513292 -0500

cifs: return ENAMETOOLONG for overlong names in cifs_open()/cifs_lookup()

Add checking for the path component length and verify it is <= the maximum
that the server advertizes via FileFsAttributeInformation.

With this patch cifs.ko will now return ENAMETOOLONG instead of ENOENT
when users to access an overlong path.

To test this, try to cd into a (non-existing) directory on a CIFS share
that has a too long name:
cd /mnt/aaaaaaaaaaaaaaa...

and it now should show a good error message from the shell:
bash: cd: /mnt/aaaaaaaaaaaaaaaa...aaaaaa: File name too long

rh bz 1153996

Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>
Cc: <stable@vger.kernel.org>