From b4487b93545214a9db8cbf32e86411677b0cca21 Mon Sep 17 00:00:00 2001 From: Jeffrey Mitchell Date: Wed, 5 Aug 2020 12:23:19 -0500 Subject: nfs: Fix getxattr kernel panic and memory overflow Move the buffer size check to decode_attr_security_label() before memcpy() Only call memcpy() if the buffer is large enough Fixes: aa9c2669626c ("NFS: Client implementation of Labeled-NFS") Signed-off-by: Jeffrey Mitchell [Trond: clean up duplicate test of label->len != 0] Signed-off-by: Trond Myklebust --- fs/nfs/nfs4xdr.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'fs/nfs/nfs4xdr.c') diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c index 388ac520b104..79018938d6b3 100644 --- a/fs/nfs/nfs4xdr.c +++ b/fs/nfs/nfs4xdr.c @@ -4166,7 +4166,11 @@ static int decode_attr_security_label(struct xdr_stream *xdr, uint32_t *bitmap, return -EIO; if (len < NFS4_MAXLABELLEN) { if (label) { - memcpy(label->label, p, len); + if (label->len) { + if (label->len < len) + return -ERANGE; + memcpy(label->label, p, len); + } label->len = len; label->pi = pi; label->lfs = lfs; -- cgit v1.2.3 '/> Mirror of https://github.com/tmate-io/tmatematthias
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