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* [PATCH v2] NFSD: prevent integer overflow on 32 bit systems
@ 2022-03-15 15:34 Dan Carpenter
  2022-03-15 16:22 ` Chuck Lever III
  0 siblings, 1 reply; 4+ messages in thread
From: Dan Carpenter @ 2022-03-15 15:34 UTC (permalink / raw)
  To: Chuck Lever
  Cc: Anna Schumaker, Chuck Lever, linux-nfs, Trond Myklebust,
	kernel-janitors

On a 32 bit system, the "len * sizeof(*p)" operation can have an
integer overflow.

c: stable@vger.kernel.org
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
v2: add stable to the CC.  Use SIZE_MAX.

 include/linux/sunrpc/xdr.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/sunrpc/xdr.h b/include/linux/sunrpc/xdr.h
index b519609af1d0..4417f667c757 100644
--- a/include/linux/sunrpc/xdr.h
+++ b/include/linux/sunrpc/xdr.h
@@ -731,6 +731,8 @@ 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;
-- 
2.20.1


^ permalink raw reply related	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2022-03-15 16:40 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
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2022-03-15 15:34 [PATCH v2] NFSD: prevent integer overflow on 32 bit systems Dan Carpenter
2022-03-15 16:22 ` Chuck Lever III
2022-03-15 16:30   ` Trond Myklebust
2022-03-15 16:39     ` Chuck Lever III

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