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SubjectRe: [PATCH v2] vt: Fix a missing-check bug in drivers/tty/vt/vt.c
On Tue, May 21, 2019 at 12:30:38AM -0400, Nicolas Pitre wrote:
> Now imagine that MIN_NR_CONSOLES is defined to 10 instead of 1.
>
> What happens with allocated memory if the err_vc condition is met on the
> 5th loop?
Yes, vc->vc_screenbuf from the last loop is still not freed, right? I
don't have idea to solve this one. Could please give some advice? Since
we have to consider the err_vc condition.

> If err_vc_screenbuf condition is encountered on the 5th loop (curcons =
> 4), what is the value of vc_cons[4].d? Isn't it the same as vc that you
> just freed?
>
>
> Nicolas
Thanks for your explaination! You mean a double free situation may
happen, right? But in vc_allocate() there is also such a kfree(vc) and
vc_cons[currcons].d = NULL operation. This situation is really confusing
me.
Thanks
Gen

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