| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.10 047/599] NFSD: prevent integer overflow on 32 bit systems | Date | Tue, 5 Apr 2022 09:25:41 +0200 |
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From: Dan Carpenter <dan.carpenter@oracle.com>
commit 23a9dbbe0faf124fc4c139615633b9d12a3a89ef upstream.
On a 32 bit system, the "len * sizeof(*p)" operation can have an integer overflow.
Cc: stable@vger.kernel.org Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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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