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From:   Sasha Levin <sashal@kernel.org>
To:     linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc:     Dominique Martinet <asmadeus@codewreck.org>,
        Simon Horman <simon.horman@corigine.com>,
        Eric Van Hensbergen <ericvh@kernel.org>,
        Sasha Levin <sashal@kernel.org>, lucho@ionkov.net,
        davem@davemloft.net, edumazet@google.com, kuba@kernel.org,
        pabeni@redhat.com, v9fs@lists.linux.dev, netdev@vger.kernel.org
Subject: [PATCH AUTOSEL 5.15 05/31] 9p: virtio: make sure 'offs' is initialized in zc_request
Date:   Sun, 13 Aug 2023 12:05:38 -0400
Message-Id: <20230813160605.1080385-5-sashal@kernel.org>
In-Reply-To: <20230813160605.1080385-1-sashal@kernel.org>
References: <20230813160605.1080385-1-sashal@kernel.org>
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From: Dominique Martinet <asmadeus@codewreck.org>

[ Upstream commit 4a73edab69d3a6623f03817fe950a2d9585f80e4 ]

Similarly to the previous patch: offs can be used in handle_rerrors
without initializing on small payloads; in this case handle_rerrors will
not use it because of the size check, but it doesn't hurt to make sure
it is zero to please scan-build.

This fixes the following warning:
net/9p/trans_virtio.c:539:3: warning: 3rd function call argument is an uninitialized value [core.CallAndMessage]
                handle_rerror(req, in_hdr_len, offs, in_pages);
                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>
Signed-off-by: Eric Van Hensbergen <ericvh@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 net/9p/trans_virtio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/9p/trans_virtio.c b/net/9p/trans_virtio.c
index d110df3cb4e1d..96eecc2dcaa36 100644
--- a/net/9p/trans_virtio.c
+++ b/net/9p/trans_virtio.c
@@ -399,7 +399,7 @@ p9_virtio_zc_request(struct p9_client *client, struct p9_req_t *req,
 	struct page **in_pages = NULL, **out_pages = NULL;
 	struct virtio_chan *chan = client->trans;
 	struct scatterlist *sgs[4];
-	size_t offs;
+	size_t offs = 0;
 	int need_drop = 0;
 	int kicked = 0;
 
-- 
2.40.1