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Re: [Qemu-stable] [PATCH v3 06/16] i2c: Add a length check to the SMBus
From: |
Philippe Mathieu-Daudé |
Subject: |
Re: [Qemu-stable] [PATCH v3 06/16] i2c: Add a length check to the SMBus write handling |
Date: |
Mon, 26 Nov 2018 21:33:41 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.3.0 |
On 26/11/18 21:04, address@hidden wrote:
> From: Corey Minyard <address@hidden>
>
> Avoid an overflow.
>
> Signed-off-by: Corey Minyard <address@hidden>
> Reviewed-by: Peter Maydell <address@hidden>
Reviewed-by: Philippe Mathieu-Daudé <address@hidden>
Tested-by: Philippe Mathieu-Daudé <address@hidden>
> ---
> hw/i2c/smbus_slave.c | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/hw/i2c/smbus_slave.c b/hw/i2c/smbus_slave.c
> index 70ff29c095..d03f714608 100644
> --- a/hw/i2c/smbus_slave.c
> +++ b/hw/i2c/smbus_slave.c
> @@ -182,7 +182,11 @@ static int smbus_i2c_send(I2CSlave *s, uint8_t data)
> switch (dev->mode) {
> case SMBUS_WRITE_DATA:
> DPRINTF("Write data %02x\n", data);
> - dev->data_buf[dev->data_len++] = data;
> + if (dev->data_len >= sizeof(dev->data_buf)) {
> + BADF("Too many bytes sent\n");
> + } else {
> + dev->data_buf[dev->data_len++] = data;
> + }
> break;
>
> default:
>
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