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 4.11-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-4.11 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From a91e0f680bcd9e10c253ae8b62462a38bd48f09f Mon Sep 17 00:00:00 2001 From: Ilya Matveychikov <matvejchikov@xxxxxxxxx> Date: Fri, 23 Jun 2017 15:08:49 -0700 Subject: lib/cmdline.c: fix get_options() overflow while parsing ranges From: Ilya Matveychikov <matvejchikov@xxxxxxxxx> 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@xxxxxxxxx Signed-off-by: Ilya V. Matveychikov <matvejchikov@xxxxxxxxx> Cc: Jonathan Corbet <corbet@xxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- lib/cmdline.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) --- 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 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 matvejchikov@xxxxxxxxx are queue-4.11/lib-cmdline.c-fix-get_options-overflow-while-parsing-ranges.patch