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authorIlya Matveychikov <[email protected]>2017-06-23 15:08:49 -0700
committerLinus Torvalds <[email protected]>2017-06-23 16:15:55 -0700
commita91e0f680bcd9e10c253ae8b62462a38bd48f09f (patch)
tree38c36b40b5f3c74182d14c346e04c5ae1c853ba2
parent1eb643d02b21412e603b42cdd96010a2ac31c05f (diff)
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/[email protected] Signed-off-by: Ilya V. Matveychikov <[email protected]> Cc: Jonathan Corbet <[email protected]> Cc: <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
-rw-r--r--lib/cmdline.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/lib/cmdline.c b/lib/cmdline.c
index 3c6432df7e63..4c0888c4a68d 100644
--- a/lib/cmdline.c
+++ b/lib/cmdline.c
@@ -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;
/*