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Date: Wed, 28 Jan 2015 12:09:20 +0800 From: lizf@...nel.org To: stable@...r.kernel.org Cc: linux-kernel@...r.kernel.org, "J. Bruce Fields" <bfields@...hat.com>, Zefan Li <lizefan@...wei.com> Subject: [PATCH 3.4 102/177] nfsd4: fix crash on unknown operation number From: "J. Bruce Fields" <bfields@...hat.com> 3.4.106-rc1 review patch. If anyone has any objections, please let me know. ------------------ 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@...hat.com> Signed-off-by: Zefan Li <lizefan@...wei.com> --- fs/nfsd/nfs4proc.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c index 22beaff..b2ce878 100644 --- a/fs/nfsd/nfs4proc.c +++ b/fs/nfsd/nfs4proc.c @@ -1132,7 +1132,8 @@ 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 -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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