Commit 25a097f5 authored by Peilin Ye's avatar Peilin Ye Committed by Jiri Kosina

HID: hiddev: Fix slab-out-of-bounds write in hiddev_ioctl_usage()

`uref->usage_index` is not always being properly checked, causing
hiddev_ioctl_usage() to go out of bounds under some cases. Fix it.

Reported-by: syzbot+34ee1b45d88571c2fa8b@syzkaller.appspotmail.com
Link: https://syzkaller.appspot.com/bug?id=f2aebe90b8c56806b050a20b36f51ed6acabe802Reviewed-by: default avatarDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: default avatarPeilin Ye <yepeilin.cs@gmail.com>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
parent 627a4997
......@@ -519,12 +519,16 @@ static noinline int hiddev_ioctl_usage(struct hiddev *hiddev, unsigned int cmd,
switch (cmd) {
case HIDIOCGUSAGE:
if (uref->usage_index >= field->report_count)
goto inval;
uref->value = field->value[uref->usage_index];
if (copy_to_user(user_arg, uref, sizeof(*uref)))
goto fault;
goto goodreturn;
case HIDIOCSUSAGE:
if (uref->usage_index >= field->report_count)
goto inval;
field->value[uref->usage_index] = uref->value;
goto goodreturn;
......
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