[PATCH] password: fixed underflow on <backspace>

[Sascha Hauer]

On Tue, Dec 04, 2012 at 01:04:25PM +0100, Enrico Scholz wrote:
> due to missing/misplaced boundary check, deleting characters could
> underflow the password buffer.
> 
> Signed-off-by: Enrico Scholz <enrico.scholz at sigma-chemnitz.de>

Applied, thanks

Sascha

> ---
>  common/password.c | 13 ++++++++-----
>  1 file changed, 8 insertions(+), 5 deletions(-)
> 
> diff --git a/common/password.c b/common/password.c
> index a03e1db..d157a11 100644
> --- a/common/password.c
> +++ b/common/password.c
> @@ -66,11 +66,14 @@ int password(unsigned char *passwd, size_t length, int flags, int timeout)
>  			case CTL_CH('h'):
>  			case KEY_DEL7:
>  			case KEY_DEL:
> -				if (flags & STAR && pos > 0)
> -					puts("\b \b");
> -				*buf = '\0';
> -				buf--;
> -				pos--;
> +				if (pos > 0) {
> +					if (flags & STAR)
> +						puts("\b \b");
> +
> +					*buf = '\0';
> +					buf--;
> +					pos--;
> +				}
>  				continue;
>  			default:
>  				if (pos < length - 1) {
> -- 
> 1.7.11.7
> 
> 
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> 

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