cdx: Fix off-by-one error in cdx_rpmsg_probe()

commit 300a0cf upstream.

In cdx_rpmsg_probe(), strscpy() is incorrectly called with the length of
the source string (excluding the NUL terminator) rather than the size of
the destination buffer. This results in one character less being copied
from 'cdx_rpmsg_id_table[0].name' to 'chinfo.name'.

Use the destination buffer size instead to ensure the name is copied
correctly.

Cc: stable <stable@kernel.org>
Fixes: 2a22692 ("cdx: add rpmsg communication channel for CDX")
Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Link: https://lore.kernel.org/r/20250806090512.121260-2-thorsten.blum@linux.dev
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: toblux

drivers/cdx/controller/cdx_rpmsg.c

@@ -129,8 +129,7 @@ static int cdx_rpmsg_probe(struct rpmsg_device *rpdev)
 
 	chinfo.src = RPMSG_ADDR_ANY;
 	chinfo.dst = rpdev->dst;
-	strscpy(chinfo.name, cdx_rpmsg_id_table[0].name,
-		strlen(cdx_rpmsg_id_table[0].name));
+	strscpy(chinfo.name, cdx_rpmsg_id_table[0].name, sizeof(chinfo.name));
 
 	cdx_mcdi->ept = rpmsg_create_ept(rpdev, cdx_rpmsg_cb, NULL, chinfo);
 	if (!cdx_mcdi->ept) {