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Re: [PATCH] um: Fix pointer cast

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  Re: [PATCH] um: Fix pointer cast Richard Weinberger <richard@nod.at> - 2015-12-22 22:30 +0100

#1297073 — Re: [PATCH] um: Fix pointer cast

Am 22.12.2015 um 21:44 schrieb Mickaël Salaün:
> Fix a pointer cast typo introduced in v4.4-rc5 especially visible for
> the i386 subarchitecture where it results in a kernel crash.
> 
> Fixes: 8090bfd2bb9a ("um: Fix fpstate handling")
> 
> Signed-off-by: Mickaël Salaün <mic@digikod.net>
> Cc: Jeff Dike <jdike@addtoit.com>
> Cc: Richard Weinberger <richard@nod.at>
> Cc: Linus Torvalds <torvalds@linux-foundation.org>
> ---
>  arch/x86/um/signal.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/x86/um/signal.c b/arch/x86/um/signal.c
> index e5f854ce2d72..cbb541b80358 100644
> --- a/arch/x86/um/signal.c
> +++ b/arch/x86/um/signal.c
> @@ -470,7 +470,7 @@ long sys_sigreturn(void)
>  	struct sigcontext __user *sc = &frame->sc;
>  	int sig_size = (_NSIG_WORDS - 1) * sizeof(unsigned long);
>  
> -	if (copy_from_user(&set.sig[0], (void *)sc->oldmask, sizeof(set.sig[0])) ||
> +	if (copy_from_user(&set.sig[0], (void *)&sc->oldmask, sizeof(set.sig[0])) ||
>  	    copy_from_user(&set.sig[1], frame->extramask, sig_size))
>  		goto segfault;

o_O, thanks for catching this!

Thanks,
//richard
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