9p: virtio: make sure 'offs' is initialized in zc_request

[ 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>

diff --git a/net/9p/trans_virtio.c b/net/9p/trans_virtio.c
index 6a4a29a..3cf660d 100644 (file)
--- a/net/9p/trans_virtio.c
+++ b/net/9p/trans_virtio.c
@@ -429,7 +429,7 @@ 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;