Messages in this thread | | | Date | Thu, 4 Jun 2020 08:30:13 +0200 | From | Greg KH <> | Subject | Re: [PATCH] char_driver_warn_unseeded_randomness: Add null check |
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On Wed, Jun 03, 2020 at 10:29:07PM -0400, gaurav singh wrote: > File: drivers/char/random.c > Function: _warn_unseeded_randomness > > There is a check for previous(ptr) before dereferencing: > > if (print_once || > crng_ready() || > (previous && (caller == READ_ONCE(*previous)))) > return; > > However, after this, it is dereferenced without checking: > WRITE_ONCE(*previous, caller); > > To fix this, add a null check > > Please find the patch below. Let me know if there's any issue. > > Thanks, > Gaurav. > > > >From 5e53cbce018c4d57753a6740c22d826bae0aab3f Mon Sep 17 00:00:00 2001 > From: Gaurav Singh <gaurav1086@gmail.com> > Date: Wed, 3 Jun 2020 22:23:47 -0400 > Subject: [PATCH] char_driver_warn_unseeded_randomness: Add null check for > previous > > Signed-off-by: Gaurav Singh <gaurav1086@gmail.com> > --- > drivers/char/random.c | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > > diff --git a/drivers/char/random.c b/drivers/char/random.c > index 0d10e31fd342..4f1975e7f201 100644 > --- a/drivers/char/random.c > +++ b/drivers/char/random.c > @@ -1526,7 +1526,9 @@ static void _warn_unseeded_randomness(const char > *func_name, void *caller, > crng_ready() || > (previous && (caller == READ_ONCE(*previous)))) > return; > - WRITE_ONCE(*previous, caller); > + > + if (previous) > + WRITE_ONCE(*previous, caller); > #ifndef CONFIG_WARN_ALL_UNSEEDED_RANDOM > print_once = true; > #endif > -- > 2.17.1
Hi,
This is the friendly patch-bot of Greg Kroah-Hartman. You have sent him a patch that has triggered this response. He used to manually respond to these common problems, but in order to save his sanity (he kept writing the same thing over and over, yet to different people), I was created. Hopefully you will not take offence and will fix the problem in your patch and resubmit it so that it can be accepted into the Linux kernel tree.
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thanks,
greg k-h's patch email bot
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