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i2c: fix stack buffer overflow vulnerability in i2c md command

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This reinstates fix from commit 8f8c04bf1e ("i2c: fix stack buffer
overflow vulnerability in i2c md command") 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@denx.de>
Cc: Heiko Schocher <hs@denx.de>
Cc: Nicolas Iooss <nicolas.iooss+uboot@ledger.fr>
Cc: Simon Glass <sjg@chromium.org>
Cc: Tim Harvey <tharvey@gateworks.com>
Acked-by: Tim Harvey <tharvey@gateworks.com>
This commit is contained in:
Marek Vasut 2022-08-26 23:15:56 +02:00 • committed by Tom Rini
parent 1aa9a04ff6
commit e4573fef77
1 changed files with 2 additions and 1 deletions
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3
cmd/i2c.c
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@ -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;