linux-kernel - [PATCH AUTOSEL 4.14 1/9] 9p: virtio: make sure 'offs' is initialized in zc

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Message-Id: <20230813161427.1089101-1-sashal@kernel.org>
Date:   Sun, 13 Aug 2023 12:14:19 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Dominique Martinet <asmadeus@...ewreck.org>,
        Simon Horman <simon.horman@...igine.com>,
        Eric Van Hensbergen <ericvh@...nel.org>,
        Sasha Levin <sashal@...nel.org>, lucho@...kov.net,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, v9fs@...ts.linux.dev, netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 4.14 1/9] 9p: virtio: make sure 'offs' is initialized in zc_request

From: Dominique Martinet <asmadeus@...ewreck.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@...igine.com>
Signed-off-by: Dominique Martinet <asmadeus@...ewreck.org>
Signed-off-by: Eric Van Hensbergen <ericvh@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.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 c6a46e8e9eda5..25f5caa57289b 100644
--- a/net/9p/trans_virtio.c
+++ b/net/9p/trans_virtio.c
@@ -401,7 +401,7 @@ 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;
 
 	p9_debug(P9_DEBUG_TRANS, "virtio request\n");
-- 
2.40.1