aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorIlya Matveychikov <matvejchikov@gmail.com>2017-06-23 15:08:49 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-06-29 12:48:51 +0200
commit7b88f761929e86813c2a1eb878dcc17abbb6119f (patch)
tree36962eff1fd92db6447a4ab68abcabbd684c02a5
parentb95aa98e77d7086f4a303a5e9402ab165a5f0cc6 (diff)
downloadlinux-linaro-stable-7b88f761929e86813c2a1eb878dcc17abbb6119f.tar.gz
lib/cmdline.c: fix get_options() overflow while parsing ranges
commit a91e0f680bcd9e10c253ae8b62462a38bd48f09f upstream. When using get_options() it's possible to specify a range of numbers, like 1-100500. The problem is that it doesn't track array size while calling internally to get_range() which iterates over the range and fills the memory with numbers. Link: http://lkml.kernel.org/r/2613C75C-B04D-4BFF-82A6-12F97BA0F620@gmail.com Signed-off-by: Ilya V. Matveychikov <matvejchikov@gmail.com> Cc: Jonathan Corbet <corbet@lwn.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--lib/cmdline.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/lib/cmdline.c b/lib/cmdline.c
index 8f13cf73c2ec..79069d7938ea 100644
--- a/lib/cmdline.c
+++ b/lib/cmdline.c
@@ -22,14 +22,14 @@
* the values[M, M+1, ..., N] into the ints array in get_options.
*/
-static int get_range(char **str, int *pint)
+static int get_range(char **str, int *pint, int n)
{
int x, inc_counter, upper_range;
(*str)++;
upper_range = simple_strtol((*str), NULL, 0);
inc_counter = upper_range - *pint;
- for (x = *pint; x < upper_range; x++)
+ for (x = *pint; n && x < upper_range; x++, n--)
*pint++ = x;
return inc_counter;
}
@@ -96,7 +96,7 @@ char *get_options(const char *str, int nints, int *ints)
break;
if (res == 3) {
int range_nums;
- range_nums = get_range((char **)&str, ints + i);
+ range_nums = get_range((char **)&str, ints + i, nints - i);
if (range_nums < 0)
break;
/*