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| author | Michael S. Tsirkin <mst@redhat.com> | 2014-12-01 13:31:45 +0200 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2014-12-09 12:06:33 +0200 |
| commit | 48b36066b48025b7cd7d46c9a879f2f72fd9086a (patch) | |
| tree | d5a9f3eef7c7d4da573a7a671e34885043f55853 /drivers/char | |
| parent | 2e73c716ba22b3b3df56be25132df2774967f2b1 (diff) | |
| download | linux-48b36066b48025b7cd7d46c9a879f2f72fd9086a.tar.gz linux-48b36066b48025b7cd7d46c9a879f2f72fd9086a.tar.bz2 linux-48b36066b48025b7cd7d46c9a879f2f72fd9086a.zip | |
virtio_console: fix sparse warnings
CHECK drivers/char/virtio_console.c
drivers/char/virtio_console.c:687:36: warning: incorrect type in
argument 1 (different address spaces)
drivers/char/virtio_console.c:687:36: expected void [noderef]
<asn:1>*to
drivers/char/virtio_console.c:687:36: got char *out_buf
drivers/char/virtio_console.c:790:35: warning: incorrect type in
argument 2 (different address spaces)
drivers/char/virtio_console.c:790:35: expected char *out_buf
drivers/char/virtio_console.c:790:35: got char [noderef]
<asn:1>*ubuf
fill_readbuf is reused with both kernel and userspace pointers,
depending on value of to_user flag.
Tag address parameter as __user, and cast to/from regular pointer type
when we know it's safe.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/virtio_console.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c index 6cc832b45185..de03df9dd7c9 100644 --- a/drivers/char/virtio_console.c +++ b/drivers/char/virtio_console.c @@ -669,8 +669,8 @@ done: * Give out the data that's requested from the buffer that we have * queued up. */ -static ssize_t fill_readbuf(struct port *port, char *out_buf, size_t out_count, - bool to_user) +static ssize_t fill_readbuf(struct port *port, char __user *out_buf, + size_t out_count, bool to_user) { struct port_buffer *buf; unsigned long flags; @@ -688,7 +688,8 @@ static ssize_t fill_readbuf(struct port *port, char *out_buf, size_t out_count, if (ret) return -EFAULT; } else { - memcpy(out_buf, buf->buf + buf->offset, out_count); + memcpy((__force char *)out_buf, buf->buf + buf->offset, + out_count); } buf->offset += out_count; @@ -1162,7 +1163,7 @@ static int get_chars(u32 vtermno, char *buf, int count) /* If we don't have an input queue yet, we can't get input. */ BUG_ON(!port->in_vq); - return fill_readbuf(port, buf, count, false); + return fill_readbuf(port, (__force char __user *)buf, count, false); } static void resize_console(struct port *port) |