On Fri, Sep 6, 2013 at 11:55 AM, David Herrmann <[email protected]> wrote:
> On Fri, Sep 6, 2013 at 11:32 AM, Tom Gundersen <[email protected]> wrote:
>> lfb_size can easily be say 4M, which would make the bitshit overflow and
>> the test fail.
>>
>> Signed-off-by: Tom Gundersen <[email protected]>
>> Cc: David Herrmann <[email protected]>
>> Cc: H. Peter Anvin <[email protected]>
>> ---
>> arch/x86/kernel/sysfb_simplefb.c | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/arch/x86/kernel/sysfb_simplefb.c
>> b/arch/x86/kernel/sysfb_simplefb.c
>> index 22513e9..fff44a5 100644
>> --- a/arch/x86/kernel/sysfb_simplefb.c
>> +++ b/arch/x86/kernel/sysfb_simplefb.c
>> @@ -72,7 +72,7 @@ __init int create_simplefb(const struct screen_info *si,
>> * the part that is occupied by the framebuffer */
>> len = mode->height * mode->stride;
>> len = PAGE_ALIGN(len);
>> - if (len > si->lfb_size << 16) {
>> + if (len > ((unsigned long) si->lfb_size) << 16) {
On 32-bit, "unsigned long" is the same size as __u32, so this doesn't
make any difference.
> Nice catch. vesafb uses "lfb_size * 65535" which causes an implicit
> cast. I thought <<16 looks nicer but that doesn't do any implicit
> cast..
"lfb_size * 65535" is the same. "lfb_size" is __u32, "65535" is int.
So there's no implicit cast. Or am I missing something?
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- [email protected]
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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