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Date: Mon, 29 Jun 2020 11:18:11 -0400 From: Sasha Levin <sashal@...nel.org> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org Cc: Chuck Lever <chuck.lever@...cle.com>, Anna Schumaker <Anna.Schumaker@...app.com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org> Subject: [PATCH 5.7 258/265] SUNRPC: Properly set the @subbuf parameter of xdr_buf_subsegment() From: Chuck Lever <chuck.lever@...cle.com> commit 89a3c9f5b9f0bcaa9aea3e8b2a616fcaea9aad78 upstream. @subbuf is an output parameter of xdr_buf_subsegment(). A survey of call sites shows that @subbuf is always uninitialized before xdr_buf_segment() is invoked by callers. There are some execution paths through xdr_buf_subsegment() that do not set all of the fields in @subbuf, leaving some pointer fields containing garbage addresses. Subsequent processing of that buffer then results in a page fault. Signed-off-by: Chuck Lever <chuck.lever@...cle.com> Cc: <stable@...r.kernel.org> Signed-off-by: Anna Schumaker <Anna.Schumaker@...app.com> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- net/sunrpc/xdr.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/net/sunrpc/xdr.c b/net/sunrpc/xdr.c index 6f7d82fb1eb0a..be11d672b5b97 100644 --- a/net/sunrpc/xdr.c +++ b/net/sunrpc/xdr.c @@ -1118,6 +1118,7 @@ xdr_buf_subsegment(struct xdr_buf *buf, struct xdr_buf *subbuf, base = 0; } else { base -= buf->head[0].iov_len; + subbuf->head[0].iov_base = buf->head[0].iov_base; subbuf->head[0].iov_len = 0; } @@ -1130,6 +1131,8 @@ xdr_buf_subsegment(struct xdr_buf *buf, struct xdr_buf *subbuf, base = 0; } else { base -= buf->page_len; + subbuf->pages = buf->pages; + subbuf->page_base = 0; subbuf->page_len = 0; } @@ -1141,6 +1144,7 @@ xdr_buf_subsegment(struct xdr_buf *buf, struct xdr_buf *subbuf, base = 0; } else { base -= buf->tail[0].iov_len; + subbuf->tail[0].iov_base = buf->tail[0].iov_base; subbuf->tail[0].iov_len = 0; } -- 2.25.1
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