[PATCH 2/2] i2c: fix stack buffer overflow vulnerability in i2c md command

[Marek Vasut]

This reinstates fix from commit 8f8c04bf1ebbd2f72f1643e7ad9617dafa6e5409
without the changes unrelated to the actual fix. Avoid the underflow by
setting only nbytes and linebytes as unsigned integers.

Signed-off-by: Marek Vasut <marex at denx.de>
Cc: Heiko Schocher <hs at denx.de>
Cc: Nicolas Iooss <nicolas.iooss+uboot at ledger.fr>
Cc: Simon Glass <sjg at chromium.org>
Cc: Tim Harvey <tharvey at gateworks.com>
---
 cmd/i2c.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/cmd/i2c.c b/cmd/i2c.c
index 9050b2b8d27..e196a73efa6 100644
--- a/cmd/i2c.c
+++ b/cmd/i2c.c
@@ -470,7 +470,8 @@ static int do_i2c_md(struct cmd_tbl *cmdtp, int flag, int argc,
 	uint	chip;
 	uint	addr, length;
 	int alen;
-	int	j, nbytes, linebytes;
+	int j;
+	uint nbytes, linebytes;
 	int ret;
 #if CONFIG_IS_ENABLED(DM_I2C)
 	struct udevice *dev;
-- 
2.35.1