NFSD: fix nfsd4_listxattr_validate_cookie

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If LISTXATTRS is sent with a correct cookie but a small maxcount,
this could lead function nfsd4_listxattr_validate_cookie to
return NFS4ERR_BAD_COOKIE. If maxcount = 20, then second check
on function gives RHS = 3 thus any cookie larger than 3 returns
NFS4ERR_BAD_COOKIE.

There is no need to validate the cookie on the return XDR buffer
since attribute referenced by cookie will be the first in the
return buffer.

Fixes: 23e50fe3a5 ("nfsd: implement the xattr functions and en/decode logic")
Signed-off-by: Jorge Mora <mora@netapp.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

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Jorge Mora 2024-01-25 07:46:54 -07:00 • committed by Chuck Lever

parent 5ff318f645

commit 52a357db80

1 changed files with 1 additions and 6 deletions

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fs/nfsd/nfs4xdr.c

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