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nfsd4: fix crash on unknown operation number 

commit 51904b08072a8bf2b9ed74d1bd7a5300a614471d upstream.

Unknown operation numbers are caught in nfsd4_decode_compound() which
sets op->opnum to OP_ILLEGAL and op->status to nfserr_op_illegal.  The
error causes the main loop in nfsd4_proc_compound() to skip most
processing.  But nfsd4_proc_compound also peeks ahead at the next
operation in one case and doesn't take similar precautions there.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
J. Bruce Fields 2014-10-22 14:46:29 -04:00 committed by Greg Kroah-Hartman
parent 770600e703
commit b51649f0c0
1 changed files with 2 additions and 1 deletions
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fs/nfsd/nfs4proc.c
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@ -1191,7 +1191,8 @@ static bool need_wrongsec_check(struct svc_rqst *rqstp)
*/
if (argp->opcnt == resp->opcnt)
return false;
if (next->opnum == OP_ILLEGAL)
return false;
nextd = OPDESC(next);
/*
* Rest of 2.6.3.1.1: certain operations will return WRONGSEC