Messages in this thread | | | Date | Thu, 1 Jun 2017 16:40:19 +0200 | From | Jean Delvare <> | Subject | Re: [PATCH] firmware: dmi: Check DMI structure length |
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Hi Andy,
Thanks for the review.
On Thu, 1 Jun 2017 16:16:05 +0300, Andy Shevchenko wrote: > On Thu, Jun 1, 2017 at 4:08 PM, Jean Delvare <jdelvare@suse.de> wrote: > > Before accessing DMI data to record it for later, we should ensure > > that the DMI structures are large enough to contain the data in > > question. > > > - const u8 *d = (u8 *) dm + index; > > + const u8 *d; > > > + d = (u8 *) dm + index; > > I think you may leave this as is and make it compiler's burden to optimize.
Is there any benefit except making the patch smaller?
> > - const u8 *d = (u8 *) dm + index; > > + const u8 *d; > > > + d = (u8 *) dm + index; > > Ditto. > > > - int i, count = *(u8 *)(dm + 1); > > + int i, count; > > > + count = *(u8 *)(dm + 1); > > Ditto.
I would expect a static code analyzer to complain about at least the last one. Dereferencing a pointer before checking its validity is bad.
I'm not a big fan of counting of compiler optimizations to make the code right.
-- Jean Delvare SUSE L3 Support
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