From: Jesper Juhl <jj@chaosbits.net>
Date: Mon, 24 Jan 2011 20:14:33 +0000 (+0100)
Subject: PCI: Avoid potential NULL pointer dereference in pci_scan_bridge
X-Git-Tag: v2.6.39-rc1~416^2~13
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7c867c8899e873652ef98a890d2e647c092bec25;p=pandora-kernel.git

PCI: Avoid potential NULL pointer dereference in pci_scan_bridge

pci_add_new_bus() calls pci_alloc_child_bus() which calls pci_alloc_bus()
that allocates memory dynamically with kzalloc(). The return value of
kzalloc() is the pointer that's eventually returned from
pci_add_new_bus(), so since kzalloc() can fail and return NULL so can
pci_add_new_bus(). Thus we may end up dereferencing a NULL pointer in
drivers/pci/probe.c::pci_scan_bridge(). Seems to me we should test for
this and bail out if it happens rather than crashing.
Also removed some trailing whitespace that bugged me while looking at
this.

Signed-off-by: Jesper Juhl <jj@chaosbits.net>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
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