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Date: Mon, 1 May 2017 14:31:51 -0700 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Al Viro <viro@...iv.linux.org.uk> Subject: [PATCH 4.9 44/54] p9_client_readdir() fix 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Al Viro <viro@...iv.linux.org.uk> commit 71d6ad08379304128e4bdfaf0b4185d54375423e upstream. Don't assume that server is sane and won't return more data than asked for. Signed-off-by: Al Viro <viro@...iv.linux.org.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- net/9p/client.c | 4 ++++ 1 file changed, 4 insertions(+) --- a/net/9p/client.c +++ b/net/9p/client.c @@ -2101,6 +2101,10 @@ int p9_client_readdir(struct p9_fid *fid trace_9p_protocol_dump(clnt, req->rc); goto free_and_error; } + if (rsize < count) { + pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize); + count = rsize; + } p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
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