cifs: improve checking of DFS links over STATUS_OBJECT_NAME_INVALID

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[ Upstream commit b9ee2e307c6b06384b6f9e393a9b8e048e8fc277 ]

Do not map STATUS_OBJECT_NAME_INVALID to -EREMOTE under non-DFS
shares, or 'nodfs' mounts or CONFIG_CIFS_DFS_UPCALL=n builds.
Otherwise, in the slow path, get a referral to figure out whether it
is an actual DFS link.

This could be simply reproduced under a non-DFS share by running the
following

  $ mount.cifs //srv/share /mnt -o ...
  $ cat /mnt/$(printf '\U110000')
  cat: '/mnt/'$'\364\220\200\200': Object is remote

Fixes: c877ce47e137 ("cifs: reduce roundtrips on create/qinfo requests")
CC: stable@vger.kernel.org # 6.2
Signed-off-by: Paulo Alcantara (SUSE) <pc@manguebit.com>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

This commit is contained in:

Paulo Alcantara 2023-02-28 19:01:54 -03:00 • committed by Greg Kroah-Hartman

parent b0bb136122

commit 512aa2fd8c

4 changed files with 106 additions and 25 deletions

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20

fs/cifs/cifsproto.h

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67

fs/cifs/misc.c

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21

fs/cifs/smb2inode.c

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23

fs/cifs/smb2ops.c

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