[PATCH v3] gpio-hammer: Avoid potential overflow in main

[PATCH v3] gpio-hammer: Avoid potential overflow in main

[Gabriel Ravier]

If '-o' was used more than 64 times in a single invocation of gpio-hammer,
this could lead to an overflow of the 'lines' array. This commit fixes
this by avoiding the overflow and giving a proper diagnostic back to the
user

Signed-off-by: Gabriel Ravier <gabravier@gmail.com>
---
 tools/gpio/gpio-hammer.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/tools/gpio/gpio-hammer.c b/tools/gpio/gpio-hammer.c
index 0e0060a6e..083399d27 100644
--- a/tools/gpio/gpio-hammer.c
+++ b/tools/gpio/gpio-hammer.c
@@ -135,7 +135,14 @@ int main(int argc, char **argv)
 			device_name = optarg;
 			break;
 		case 'o':
-			lines[i] = strtoul(optarg, NULL, 10);
+			/*
+			 * Avoid overflow. Do not immediately error, we want to
+			 * be able to accurately report on the amount of times
+			 * '-o' was given to give an accurate error message
+			 */
+			if (i < GPIOHANDLES_MAX)
+				lines[i] = strtoul(optarg, NULL, 10);
+
 			i++;
 			break;
 		case '?':
@@ -143,6 +150,14 @@ int main(int argc, char **argv)
 			return -1;
 		}
 	}
+
+	if (i >= GPIOHANDLES_MAX) {
+		fprintf(stderr,
+			"Only %d occurences of '-o' are allowed, %d were found\n",
+			GPIOHANDLES_MAX, i + 1);
+		return -1;
+	}
+
 	nlines = i;
 
 	if (!device_name || !nlines) {
-- 
2.24.1

Re: [PATCH v3] gpio-hammer: Avoid potential overflow in main

[Bartosz Golaszewski]

czw., 12 mar 2020 o 15:50 Gabriel Ravier <gabravier@gmail.com> napisał(a):
>
> If '-o' was used more than 64 times in a single invocation of gpio-hammer,
> this could lead to an overflow of the 'lines' array. This commit fixes
> this by avoiding the overflow and giving a proper diagnostic back to the
> user
>
> Signed-off-by: Gabriel Ravier <gabravier@gmail.com>
> ---
>  tools/gpio/gpio-hammer.c | 17 ++++++++++++++++-
>  1 file changed, 16 insertions(+), 1 deletion(-)
>
> diff --git a/tools/gpio/gpio-hammer.c b/tools/gpio/gpio-hammer.c
> index 0e0060a6e..083399d27 100644
> --- a/tools/gpio/gpio-hammer.c
> +++ b/tools/gpio/gpio-hammer.c
> @@ -135,7 +135,14 @@ int main(int argc, char **argv)
>                         device_name = optarg;
>                         break;
>                 case 'o':
> -                       lines[i] = strtoul(optarg, NULL, 10);
> +                       /*
> +                        * Avoid overflow. Do not immediately error, we want to
> +                        * be able to accurately report on the amount of times
> +                        * '-o' was given to give an accurate error message
> +                        */
> +                       if (i < GPIOHANDLES_MAX)
> +                               lines[i] = strtoul(optarg, NULL, 10);
> +
>                         i++;
>                         break;
>                 case '?':
> @@ -143,6 +150,14 @@ int main(int argc, char **argv)
>                         return -1;
>                 }
>         }
> +
> +       if (i >= GPIOHANDLES_MAX) {
> +               fprintf(stderr,
> +                       "Only %d occurences of '-o' are allowed, %d were found\n",
> +                       GPIOHANDLES_MAX, i + 1);
> +               return -1;
> +       }
> +
>         nlines = i;
>
>         if (!device_name || !nlines) {
> --
> 2.24.1
>

Patch applied, thanks!

Bartosz