Patch "lib/cmdline.c: fix get_options() overflow while parsing ranges" has been added to the 4.4-stable tree

This is a note to let you know that I've just added the patch titled

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

to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
lib-cmdline.c-fix-get_options-overflow-while-parsing-ranges.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Ilya Matveychikov <[email protected]>
Date: Fri, 23 Jun 2017 15:08:49 -0700
Subject: lib/cmdline.c: fix get_options() overflow while parsing ranges

From: Ilya Matveychikov <[email protected]>

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.

---
 lib/cmdline.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

@@ -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 n
 			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;
 			/*

Patches currently in stable-queue which might be from [email protected] are

queue-4.4/lib-cmdline.c-fix-get_options-overflow-while-parsing-ranges.patch