diff options
| author | Zev Weiss <zev@bewilderbeest.net> | 2019-03-11 23:28:02 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-03-12 10:04:00 -0700 |
| commit | 8cf7630b29701d364f8df4a50e4f1f5e752b2778 (patch) | |
| tree | c321055315f9bdfcd4350ee37f84f32db569965f | |
| parent | fec52486682f7b3af2ffc28bcacc6e2ad6f7e1e6 (diff) | |
| download | linux-8cf7630b29701d364f8df4a50e4f1f5e752b2778.tar.bz2 | |
kernel/sysctl.c: add missing range check in do_proc_dointvec_minmax_conv
This bug has apparently existed since the introduction of this function
in the pre-git era (4500e91754d3 in Thomas Gleixner's history.git,
"[NET]: Add proc_dointvec_userhz_jiffies, use it for proper handling of
neighbour sysctls.").
As a minimal fix we can simply duplicate the corresponding check in
do_proc_dointvec_conv().
Link: http://lkml.kernel.org/r/20190207123426.9202-3-zev@bewilderbeest.net
Signed-off-by: Zev Weiss <zev@bewilderbeest.net>
Cc: Brendan Higgins <brendanhiggins@google.com>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Luis Chamberlain <mcgrof@kernel.org>
Cc: <stable@vger.kernel.org> [2.6.2+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | kernel/sysctl.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 7bb3988425ee..0854197e0e67 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -2645,7 +2645,16 @@ static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp, { struct do_proc_dointvec_minmax_conv_param *param = data; if (write) { - int val = *negp ? -*lvalp : *lvalp; + int val; + if (*negp) { + if (*lvalp > (unsigned long) INT_MAX + 1) + return -EINVAL; + val = -*lvalp; + } else { + if (*lvalp > (unsigned long) INT_MAX) + return -EINVAL; + val = *lvalp; + } if ((param->min && *param->min > val) || (param->max && *param->max < val)) return -EINVAL; |