cifs: extra sanity checking for cifs.idmap keys

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Now that we aren't so rigid about the length of the key being passed
in, we need to be a bit more rigorous about checking the length of
the actual data against the claimed length (a'la num_subauths field).

Check for the case where userspace sends us a seemingly valid key
with a num_subauths field that goes beyond the end of the array. If
that happens, return -EIO and invalidate the key.

Also change the other places where we check for malformed keys in this
code to invalidate the key as well.

Reviewed-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>

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Jeff Layton 2012-12-03 06:05:30 -05:00 • committed by Steve French

parent 41a9f1f6b3

commit 2ae03025d5

1 changed files with 18 additions and 2 deletions

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fs/cifs/cifsacl.c

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