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| author | Ilya Matveychikov <matvejchikov@gmail.com> | 2017-06-23 15:08:49 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-06-29 13:00:28 +0200 |
| commit | 7c679fe729c258f09f169d9e3f8551b6e91d97e2 (patch) | |
| tree | b09c6a69e5836d5f81f66909b1504826d436558f /lib/cmdline.c | |
| parent | bc6eecff3d9594b2d5b9f41d4b480dba720e00ca (diff) | |
| download | linux-stable-7c679fe729c258f09f169d9e3f8551b6e91d97e2.tar.gz linux-stable-7c679fe729c258f09f169d9e3f8551b6e91d97e2.tar.bz2 linux-stable-7c679fe729c258f09f169d9e3f8551b6e91d97e2.zip | |
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>
Diffstat (limited to 'lib/cmdline.c')
| -rw-r--r-- | lib/cmdline.c | 6 |
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; /* |