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Date: Thu, 16 Oct 2008 07:58:08 -0500 From: Dean Nelson <dcn@....com> To: Andrew Morton <akpm@...ux-foundation.org> Cc: Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org Subject: [PATCH] NULL struct irq_desc's member 'name' in dynamic_irq_cleanup() If the member 'name' of the irq_desc structure happens to point to a character string that is resident within a kernel module, problems insue if that module is rmmod'd (at which time dynamic_irq_cleanup() is called) and then later show_interrupts() is called by someone. It is also not a good thing if the character string resided in kmalloc'd space that has been kfree'd (after having called dynamic_irq_cleanup()). dynamic_irq_cleanup() fails to NULL the 'name' member and show_interrupts() references it on a few architectures (like h8300, sh and x86). Signed-off-by: Dean Nelson <dcn@....com> --- kernel/irq/chip.c | 1 + 1 file changed, 1 insertion(+) Index: linux/kernel/irq/chip.c =================================================================== --- linux.orig/kernel/irq/chip.c 2008-10-15 07:44:31.000000000 -0500 +++ linux/kernel/irq/chip.c 2008-10-16 06:55:56.000000000 -0500 @@ -79,6 +79,7 @@ void dynamic_irq_cleanup(unsigned int ir desc->chip_data = NULL; desc->handle_irq = handle_bad_irq; desc->chip = &no_irq_chip; + desc->name = NULL; spin_unlock_irqrestore(&desc->lock, flags); } -- 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/
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