On Thu, Apr 08, 2021 at 07:26:08PM +0800, Zhihao Cheng wrote:
> Fix to return a negative error code from the error handling
> case instead of 0, as done elsewhere in this function.
>
> Fixes: 3a253caaad11 ("char: tpm: add i2c driver for cr50")
> Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
> Signed-off-by: Zhihao Cheng <chengzhihao1@xxxxxxxxxx>
> ---
> drivers/char/tpm/tpm_tis_i2c_cr50.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/char/tpm/tpm_tis_i2c_cr50.c b/drivers/char/tpm/tpm_tis_i2c_cr50.c
> index ec9a65e7887d..e908da78fbf4 100644
> --- a/drivers/char/tpm/tpm_tis_i2c_cr50.c
> +++ b/drivers/char/tpm/tpm_tis_i2c_cr50.c
> @@ -483,6 +483,7 @@ static int tpm_cr50_i2c_tis_recv(struct tpm_chip *chip, u8 *buf, size_t buf_len)
> expected = be32_to_cpup((__be32 *)(buf + 2));
> if (expected > buf_len) {
> dev_err(&chip->dev, "Buffer too small to receive i2c data\n");
> + rc = -EIO;
> goto out_err;
> }
>
> --
> 2.25.4
>
We are using E2BIG in similar situations in a few places:
❯ git grep E2BIG drivers/char/tpm
drivers/char/tpm/tpm-dev-common.c: return -E2BIG;
drivers/char/tpm/tpm-interface.c: return -E2BIG;
drivers/char/tpm/tpm_crb.c: return -E2BIG;
drivers/char/tpm/tpm_i2c_atmel.c: return -E2BIG;
drivers/char/tpm/tpm_i2c_infineon.c: return -E2BIG;
So, I tend to think that also in here it'd be better to use E2BIG.
/Jarkko
