Cc-ing Guenter,
On (20/05/22 12:00), Petr Mladek wrote:
> On Fri 2020-05-22 16:53:06, Shreyas Joshi wrote:
> > If uboot passes a blank string to console_setup then it results in a
> > trashed memory.
> > Ultimately, the kernel crashes during freeing up the memory. This fix
> > checks if there
> > is a blank parameter being passed to console_setup from uboot.
> > In case it detects that the console parameter is blank then
> > it doesn't setup the serial device and it gracefully exits.
> >
> > Signed-off-by: Shreyas Joshi <shreyas.jo...@biamp.com>
> > ---
> > V1:
> > Fixed console_loglevel to default as per the review comments
> >
> > kernel/printk/printk.c | 5 ++++-
> > 1 file changed, 4 insertions(+), 1 deletion(-)
> >
> > diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
> > index ad4606234545..e9ad730991e0 100644
> > --- a/kernel/printk/printk.c
> > +++ b/kernel/printk/printk.c
> > @@ -2165,7 +2165,10 @@ static int __init console_setup(char *str)
> > char buf[sizeof(console_cmdline[0].name) + 4]; /* 4 for "ttyS" */
> > char *s, *options, *brl_options = NULL;
> > int idx;
> > -
> > + if (str[0] == 0) {
> > + return 1;
> > + }
> > if (_braille_console_setup(&str, &brl_options))
> > return 1;
>
> I have fixed formatting and pushed it into printk/linux.git,
> branch for-5.8.
Petr, this patch's causing regressions for us. We use blank console= boot
param to bypass dts. It appears that it'd be better to revert the change.
-ss
