diff options
| author | Baokun Li <libaokun1@huawei.com> | 2022-01-22 07:13:48 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2022-01-22 07:33:37 +0100 |
| commit | 1622ed7d0743201293094162c26019d2573ecacb (patch) | |
| tree | 1d80811a251d27416bce444b2db70d791aaa6963 | |
| parent | kernel/sysctl.c: remove unused variable ten_thousand (diff) | |
| download | linux-1622ed7d0743201293094162c26019d2573ecacb.tar.xz linux-1622ed7d0743201293094162c26019d2573ecacb.zip | |
sysctl: returns -EINVAL when a negative value is passed to proc_doulongvec_minmax
When we pass a negative value to the proc_doulongvec_minmax() function,
the function returns 0, but the corresponding interface value does not
change.
we can easily reproduce this problem with the following commands:
cd /proc/sys/fs/epoll
echo -1 > max_user_watches; echo $?; cat max_user_watches
This function requires a non-negative number to be passed in, so when a
negative number is passed in, -EINVAL is returned.
Link: https://lkml.kernel.org/r/20211220092627.3744624-1-libaokun1@huawei.com
Signed-off-by: Baokun Li <libaokun1@huawei.com>
Reported-by: Hulk Robot <hulkci@huawei.com>
Acked-by: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | kernel/sysctl.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/kernel/sysctl.c b/kernel/sysctl.c index e92e8d21d6bf..5ae443b2882e 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -1145,10 +1145,11 @@ static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, err = proc_get_long(&p, &left, &val, &neg, proc_wspace_sep, sizeof(proc_wspace_sep), NULL); - if (err) + if (err || neg) { + err = -EINVAL; break; - if (neg) - continue; + } + val = convmul * val / convdiv; if ((min && val < *min) || (max && val > *max)) { err = -EINVAL; |