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Date: Tue, 5 Apr 2022 09:25:41 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>, Chuck Lever <chuck.lever@...cle.com> Subject: [PATCH 5.10 047/599] NFSD: prevent integer overflow on 32 bit systems From: Dan Carpenter <dan.carpenter@...cle.com> commit 23a9dbbe0faf124fc4c139615633b9d12a3a89ef upstream. On a 32 bit system, the "len * sizeof(*p)" operation can have an integer overflow. Cc: stable@...r.kernel.org Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com> Signed-off-by: Chuck Lever <chuck.lever@...cle.com> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- include/linux/sunrpc/xdr.h | 2 ++ 1 file changed, 2 insertions(+) --- a/include/linux/sunrpc/xdr.h +++ b/include/linux/sunrpc/xdr.h @@ -603,6 +603,8 @@ xdr_stream_decode_uint32_array(struct xd if (unlikely(xdr_stream_decode_u32(xdr, &len) < 0)) return -EBADMSG; + if (len > SIZE_MAX / sizeof(*p)) + return -EBADMSG; p = xdr_inline_decode(xdr, len * sizeof(*p)); if (unlikely(!p)) return -EBADMSG;
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