Messages in this thread | | | Date | Mon, 11 Jan 2021 20:33:40 -0800 | From | Andrew Morton <> | Subject | Re: [PATCH v3] proc_sysctl: fix oops caused by incorrect command parameters. |
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On Tue, 12 Jan 2021 11:31:55 +0800 Xiaoming Ni <nixiaoming@huawei.com> wrote:
> The process_sysctl_arg() does not check whether val is empty before > invoking strlen(val). If the command line parameter () is incorrectly > configured and val is empty, oops is triggered. > > --- a/fs/proc/proc_sysctl.c > +++ b/fs/proc/proc_sysctl.c > @@ -1770,6 +1770,9 @@ static int process_sysctl_arg(char *param, char *val, > return 0; > } > > + if (!val) > + return -EINVAL; > +
I think v2 (return 0) was preferable. Because all the other error-out cases in process_sysctl_arg() also do a `return 0'.
If we're going to do a separate "patch: make process_sysctl_arg() return an errno instead of 0" then fine, we can discuss that. But it's conceptually a different work from fixing this situation.
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