usb: gadget: fastboot: terminate commands with NULL
Without NULL termination, various commands will read past the
end of input. In particular, this was noticed with error()
calls in cb_getvar and simple_strtoul() in cb_download.
Since the download callback happens elsewhere, the 4k buffer
should always be sufficient to handle command arguments.
Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
diff --git a/drivers/usb/gadget/f_fastboot.c b/drivers/usb/gadget/f_fastboot.c
index 392379d..71b62e5 100644
--- a/drivers/usb/gadget/f_fastboot.c
+++ b/drivers/usb/gadget/f_fastboot.c
@@ -546,7 +546,14 @@
error("unknown command: %s\n", cmdbuf);
fastboot_tx_write_str("FAILunknown command");
} else {
- func_cb(ep, req);
+ if (req->actual < req->length) {
+ u8 *buf = (u8 *)req->buf;
+ buf[req->actual] = 0;
+ func_cb(ep, req);
+ } else {
+ error("buffer overflow\n");
+ fastboot_tx_write_str("FAILbuffer overflow");
+ }
}
if (req->status == 0) {