Re: [PATCH 12/12] edac: fix kernel panic on module unloading

From: Borislav Petkov
Date: Fri Dec 14 2012 - 06:50:40 EST

On Fri, Dec 14, 2012 at 11:26:57AM +0000, Alan Cox wrote:
> On Fri, 14 Dec 2012 15:03:10 +0400
> Konstantin Khlebnikov <khlebnikov@xxxxxxxxxx> wrote:
> > This patch fixes use-after-free and double-free bugs in edac_mc_sysfs_exit().
> > mci_pdev has single reference and put_device() calls mc_attr_release() which
> > calls kfree(), thus following device_del() works with already released memory.
> > An another kfree() in edac_mc_sysfs_exit() releses the same memory again. Great.
> Patches for this were posted a while ago by Jean Delvare. See bugzilla
> 50491 as well for this.

Jean's patch is for i7core_edac but Konstantin's fixes the edac_core
which is another module. And AFAICT the correct order of destroying
devices in the driver core is

1. _del
2. _put

so I'll pick up Konstantin's patch with a tag for 3.7-stable unless
someone has objections?



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