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NFSD: prevent integer overflow on 32 bit systems

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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>
This commit is contained in:
Dan Carpenter 2022-03-15 18:34:06 +03:00 • committed by Greg Kroah-Hartman
commit ce1aa09cc1
1 changed files with 2 additions and 0 deletions
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2
include/linux/sunrpc/xdr.h
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@ -536,6 +536,8 @@ xdr_stream_decode_uint32_array(struct xdr_stream *xdr,
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;