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lib/cmdline.c: fix get_options() overflow while parsing ranges 

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>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ilya Matveychikov 2017-06-23 15:08:49 -07:00 committed by Linus Torvalds
parent 1eb643d02b
commit a91e0f680b
1 changed files with 3 additions and 3 deletions
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6
lib/cmdline.c
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@ -23,14 +23,14 @@
* 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;
}
@ -97,7 +97,7 @@ 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;
/*