lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Thu, 23 Oct 2014 09:06:48 +0200 From: Geert Uytterhoeven <geert@...ux-m68k.org> To: David Miller <davem@...emloft.net> Cc: Iyappan Subramanian <isubramanian@....com>, kchudgar@....com, "netdev@...r.kernel.org" <netdev@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: Re: [PATCH v2] drivers: net: xgene: Rewrite loop in xgene_enet_ecc_init() On Wed, Oct 22, 2014 at 10:12 PM, David Miller <davem@...emloft.net> wrote: > From: Geert Uytterhoeven <geert@...ux-m68k.org> > Date: Wed, 22 Oct 2014 21:50:06 +0200 > >> On Wed, Oct 22, 2014 at 9:34 PM, David Miller <davem@...emloft.net> wrote: >>> From: Geert Uytterhoeven <geert@...ux-m68k.org> >>> Date: Wed, 22 Oct 2014 09:39:41 +0200 >>> >>>> drivers/net/ethernet/apm/xgene/xgene_enet_sgmac.c: In function ‘xgene_enet_ecc_init’: >>>> drivers/net/ethernet/apm/xgene/xgene_enet_sgmac.c:126: warning: ‘data’ may be used uninitialized in this function >>>> >>>> Depending on the arbitrary value on the stack, the loop may terminate >>>> too early, and cause a bogus -ENODEV failure. >>>> >>>> Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org> >>>> --- >>>> v2: Rewrite the loop instead of pre-initializing data. >>> >>> I hate to be a pest, but like the other patch of your's I think >>> a do { } while() works best here because the intent is clearly >>> to run the loop at least once, right? >> >> I wanted to avoid checking for "data != ~0U" twice: once to abort the loop, >> and once to check if a timeout happened. > > Hmmm: > > do { > usleep_range(...); > data = ...(); > if (data == ~0) > return 0; > } while (++i < 10); > > netdev_err(...); > return -ENODEV; > > Why would you have to check data twice? Yes, that would work to. Feel free to do s/for (i = 0; i < 10; i++)/do/ and s/}/} while (++i < 10);/ Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org 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 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Powered by blists - more mailing lists