cifs: return ENAMETOOLONG for overlong names in cifs_open()/cifs_lookup()
authorRonnie Sahlberg <lsahlber@redhat.com>
Wed, 23 Aug 2017 04:48:14 +0000 (14:48 +1000)
committerSteve French <smfrench@gmail.com>
Wed, 23 Aug 2017 18:34:52 +0000 (13:34 -0500)
commitd3edede29f74d335f81d95a4588f5f136a9f7dcf
tree391465f2a1f199a8e5b789faca7556dac3b1ecc9
parent42bec214d8bd432be6d32a1acb0a9079ecd4d142
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>
fs/cifs/dir.c