From: J. Bruce Fields Date: Wed, 22 Oct 2014 18:46:29 +0000 (-0400) Subject: nfsd4: fix crash on unknown operation number X-Git-Tag: firefly_0821_release~176^2~2654^2~34 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=51904b08072a8bf2b9ed74d1bd7a5300a614471d;p=firefly-linux-kernel-4.4.55.git nfsd4: fix crash on unknown operation number 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. Cc: stable@vger.kernel.org Signed-off-by: J. Bruce Fields --- diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c index f4bd578bed55..0beb023f25ac 100644 --- a/fs/nfsd/nfs4proc.c +++ b/fs/nfsd/nfs4proc.c @@ -1272,7 +1272,8 @@ 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