Messages in this thread | | | Date | Fri, 18 Apr 2008 17:53:19 +0400 | From | Cyrill Gorcunov <> | Subject | Re: [patch 3/3] ThinkPad ACPI: fix possible NULL pointer dereference |
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[Pavel Machek - Fri, Apr 18, 2008 at 02:41:12PM +0200] | Hi! | | > Fix potential NULL pointer dereference if kstrdup failed | > | > Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com> | > | > --- | > | > Index: linux-2.6.git/drivers/misc/thinkpad_acpi.c | > =================================================================== | > --- linux-2.6.git.orig/drivers/misc/thinkpad_acpi.c 2008-04-16 20:35:34.000000000 +0400 | > +++ linux-2.6.git/drivers/misc/thinkpad_acpi.c 2008-04-16 20:36:38.000000000 +0400 | > @@ -5826,7 +5826,7 @@ static void __init get_thinkpad_model_da | > | > tp->model_str = kstrdup(dmi_get_system_info(DMI_PRODUCT_VERSION), | > GFP_KERNEL); | > - if (strnicmp(tp->model_str, "ThinkPad", 8) != 0) { | > + if (tp->model_str && strnicmp(tp->model_str, "ThinkPad", 8) != 0) { | > kfree(tp->model_str); | > tp->model_str = NULL; | > } | | are you sure? This seems to assume machine is thinkpad if kstrdup | fails... which is very wrong. |
Actually, my patch didn't bring any new into the current driver state, just add additional check to prevent NULL deref, that's all, so I think it's fine (but maybe additional printk with info would had been usefull).
- Cyrill -
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