[PATCH wayland] wayland-server: Properly handle EAGAIN from wl_connection_read()

[Derek Foreman]

On 2018-04-19 09:01 AM, Derek Foreman wrote:
> From: Dipen Somani <dipen.somani at samsung.com>
> 
> commit 3cddb3c692acd3536a7cc8542a29f0cc3c0ac3d6 casted len to an
> unsigned value to compare to sizeof results.  However,
> wl_connection_read() can fail, setting errno to EAGAIN and returning
> a value of -1.
> 
> When cast to an unsigned type this leads to a loop condition of true
> when it should be false.
> 
> Signed-off-by: Dipen Somani <dipen.somani at samsung.com>
> Signed-off-by: Derek Foreman <derekf at osg.samsung.com>

I forgot to add:
Reviewed-by: Derek Foreman <derekf at osg.samsung.com>

> ---
>  src/wayland-server.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/src/wayland-server.c b/src/wayland-server.c
> index eb1e500..eab2ee4 100644
> --- a/src/wayland-server.c
> +++ b/src/wayland-server.c
> @@ -353,7 +353,7 @@ wl_client_connection_data(int fd, uint32_t mask, void *data)
>  		}
>  	}
>  
> -	while ((size_t) len >= sizeof p) {
> +	while (len >= 0 && (size_t) len >= sizeof p) {
>  		wl_connection_copy(connection, p, sizeof p);
>  		opcode = p[1] & 0xffff;
>  		size = p[1] >> 16;
>