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fix potential truncation of cli arguments (#367) 

strtol() returns a `long`, but we're storing the result in an `int`
which might end up getting truncated. change `n` to `long` and guard
against >INT_MAX arguments in cases where it matters.

use a float for storing argument of `-S`

change `opt.slideshow` to `unsigned` similar to `img.ss.delay`

Co-authored-by: Berke Kocaoğlu <berke.kocaoglu@metu.edu.tr>
Reviewed-on: https://codeberg.org/nsxiv/nsxiv/pulls/367
Reviewed-by: Berke Kocaoğlu <berke.kocaoglu@metu.edu.tr>
Reviewed-by: explosion-mental <explosion-mental@noreply.codeberg.org>
This commit is contained in:
NRK 2022-09-14 06:58:41 +02:00
parent e356add07c
commit daee34477a
2 changed files with 9 additions and 8 deletions
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2
nsxiv.h
View File

@ -239,7 +239,7 @@ struct opt {
bool animate;
bool anti_alias;
int gamma;
int slideshow;
unsigned int slideshow;
int framerate;
/* window: */

15
options.c
View File

@ -98,7 +98,8 @@ void parse_options(int argc, char **argv)
{ 0 }, /* end */
};
int n, opt;
long n, opt;
float f;
char *end, *s;
struct optparse op;
const char scalemodes[] = "dfFwh"; /* must be sorted according to scalemode_t */
@ -148,7 +149,7 @@ void parse_options(int argc, char **argv)
exit(EXIT_FAILURE);
case 'A':
n = strtol(op.optarg, &end, 0);
if (*end != '\0' || n <= 0)
if (*end != '\0' || n <= 0 || n > INT_MAX)
error(EXIT_FAILURE, 0, "Invalid argument for option -A: %s", op.optarg);
_options.framerate = n;
/* fall through */
@ -172,7 +173,7 @@ void parse_options(int argc, char **argv)
break;
case 'G':
n = strtol(op.optarg, &end, 0);
if (*end != '\0')
if (*end != '\0' || n < INT_MIN || n > INT_MAX)
error(EXIT_FAILURE, 0, "Invalid argument for option -G: %s", op.optarg);
_options.gamma = n;
break;
@ -187,7 +188,7 @@ void parse_options(int argc, char **argv)
break;
case 'n':
n = strtol(op.optarg, &end, 0);
if (*end != '\0' || n <= 0)
if (*end != '\0' || n <= 0 || n > INT_MAX)
error(EXIT_FAILURE, 0, "Invalid argument for option -n: %s", op.optarg);
_options.startnum = n - 1;
break;
@ -207,10 +208,10 @@ void parse_options(int argc, char **argv)
_options.recursive = true;
break;
case 'S':
n = strtof(op.optarg, &end) * 10;
if (*end != '\0' || n <= 0)
f = strtof(op.optarg, &end) * 10.0f;
if (*end != '\0' || f <= 0 || f >= (float)UINT_MAX)
error(EXIT_FAILURE, 0, "Invalid argument for option -S: %s", op.optarg);
_options.slideshow = n;
_options.slideshow = (unsigned int)f;
break;
case 's':
s = strchr(scalemodes, op.optarg[0]);