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: Sun, 06 Jan 2013 21:08:39 -0500 From: Andy Walls <awalls@...metrocast.net> To: Nickolai Zeldovich <nickolai@...il.mit.edu>, Mauro Carvalho Chehab <mchehab@...hat.com> CC: linux-kernel@...r.kernel.org, linux-media@...r.kernel.org Subject: Re: [PATCH v2] media: cx18, ivtv: eliminate unnecessary array index checks Nickolai Zeldovich <nickolai@...il.mit.edu> wrote: >The idx values passed to cx18_i2c_register() and ivtv_i2c_register() >by cx18_init_subdevs() and ivtv_load_and_init_modules() respectively >are always in-range, based on how the hw_all bitmask is populated. >Previously, the checks were already ineffective because arrays were >being dereferenced using the index before the check. > >Signed-off-by: Nickolai Zeldovich <nickolai@...il.mit.edu> >--- >Thanks to Andy Walls for suggesting that instead of moving the checks >before array dereference, a better fix is to remove the checks >altogether, >since they are superfluous. > > drivers/media/pci/cx18/cx18-i2c.c | 3 --- > drivers/media/pci/ivtv/ivtv-i2c.c | 2 -- > 2 files changed, 5 deletions(-) > >diff --git a/drivers/media/pci/cx18/cx18-i2c.c >b/drivers/media/pci/cx18/cx18-i2c.c >index 4908eb7..ccb1d15 100644 >--- a/drivers/media/pci/cx18/cx18-i2c.c >+++ b/drivers/media/pci/cx18/cx18-i2c.c >@@ -116,9 +116,6 @@ int cx18_i2c_register(struct cx18 *cx, unsigned >idx) > const char *type = hw_devicenames[idx]; > u32 hw = 1 << idx; > >- if (idx >= ARRAY_SIZE(hw_addrs)) >- return -1; >- > if (hw == CX18_HW_TUNER) { > /* special tuner group handling */ > sd = v4l2_i2c_new_subdev(&cx->v4l2_dev, >diff --git a/drivers/media/pci/ivtv/ivtv-i2c.c >b/drivers/media/pci/ivtv/ivtv-i2c.c >index 46e262b..bc984af 100644 >--- a/drivers/media/pci/ivtv/ivtv-i2c.c >+++ b/drivers/media/pci/ivtv/ivtv-i2c.c >@@ -267,8 +267,6 @@ int ivtv_i2c_register(struct ivtv *itv, unsigned >idx) > const char *type = hw_devicenames[idx]; > u32 hw = 1 << idx; > >- if (idx >= ARRAY_SIZE(hw_addrs)) >- return -1; > if (hw == IVTV_HW_TUNER) { > /* special tuner handling */ > sd = v4l2_i2c_new_subdev(&itv->v4l2_dev, adap, type, 0, >-- >1.7.10.4 Acked-by: Andy Walls <awalls@...metrocast.net> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists