From: Kyle McMartin Date: Thu, 20 Aug 2009 01:17:08 +0000 (-0400) Subject: dma-debug: Fix check_unmap null pointer dereference X-Git-Tag: v2.6.31-rc8~30^2 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ec9c96ef3cc0124cb94375b17faaa8cff5dfdf97;p=pandora-kernel.git dma-debug: Fix check_unmap null pointer dereference While it's debatable whether or not a NULL device argument to the DMA API functions is valid... since it certainly isn't valid on devices with an IOMMU... dma-debug really shouldn't be dereferencing null pointers either. Guard against that in err_printk and the driver_filter functions. A Fedora rawhide user was seeing this in one of the dvb drivers resulting in an oops on boot. [ A patch has been sent for testing to the driver, but I feel the dma debugging support should be fixed as well. (There's still a pile of legacy garbage in the kernel passing null pointers to dma_{alloc,free}_*. :( ] Signed-off-by: Kyle McMartin Cc: mchehab@infradead.org Cc: Joerg Roedel LKML-Reference: <20090820011708.GP25206@bombadil.infradead.org> Signed-off-by: Ingo Molnar --- Reading git-diff-tree failed