Re: [PATCH] USB: gadget: f_mass_storage: fix in fsg_common_init() error recovery

["Michał Nazarewicz" <m.nazarewicz@samsung.com>]

On Wed, 12 May 2010 12:06:11 +0200, Viral Mehta <Viral.Mehta@lntinfotech.com> wrote:
> In fsg_common_release(), we are freeing common->luns.
> 2894         kfree(common->luns);
>
> However, these gets allocd in fsg_common_init()
> 2712         /* Create the LUNs, open their backing files, and register the
> 2713          * LUN devices in sysfs. */
> 2714         curlun = kzalloc(nluns * sizeof *curlun, GFP_KERNEL);
> 2715         if (!curlun) {
> 2716                 kfree(common);
> 2717                 return ERR_PTR(-ENOMEM);
> 2718         }
>
> Now, if this kzalloc at line 2714 failed
> And if your patch is applied, you will follow error_release path which in
> turn will call kfree on a pointer whose allocation is failed.

If luns allocation fails, common->luns will be NULL and freeing a NULL
pointer is a no-operation thus the code works just fine.

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