From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mu-out-0910.google.com (mu-out-0910.google.com [209.85.134.188]) by ozlabs.org (Postfix) with ESMTP id 306DBDDE43 for ; Fri, 23 Nov 2007 07:04:19 +1100 (EST) Received: by mu-out-0910.google.com with SMTP id w1so3500088mue for ; Thu, 22 Nov 2007 12:04:17 -0800 (PST) Date: Thu, 22 Nov 2007 22:54:23 +0300 From: Cyrill Gorcunov To: PPCML Subject: [PATCH] PPC: CHRP - fix possible NULL pointer dereference Message-ID: <20071122195423.GA9877@cvg> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Olof Johansson , Paul Mackerras , LKML List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: Cyrill Gorcunov This patch does fix possible NULL pointer dereference inside of strncmp() if of_get_property() failed. Signed-off-by: Cyrill Gorcunov --- arch/powerpc/platforms/chrp/setup.c | 23 +++++++++++++---------- 1 files changed, 13 insertions(+), 10 deletions(-) diff --git a/arch/powerpc/platforms/chrp/setup.c b/arch/powerpc/platforms/chrp/setup.c index 5930626..e3f276d 100644 --- a/arch/powerpc/platforms/chrp/setup.c +++ b/arch/powerpc/platforms/chrp/setup.c @@ -115,7 +115,7 @@ void chrp_show_cpuinfo(struct seq_file *m) seq_printf(m, "machine\t\t: CHRP %s\n", model); /* longtrail (goldengate) stuff */ - if (!strncmp(model, "IBM,LongTrail", 13)) { + if (model && !strncmp(model, "IBM,LongTrail", 13)) { /* VLSI VAS96011/12 `Golden Gate 2' */ /* Memory banks */ sdramen = (in_le32(gg2_pci_config_base + GG2_PCI_DRAM_CTRL) @@ -203,16 +203,19 @@ static void __init sio_fixup_irq(const char *name, u8 device, u8 level, static void __init sio_init(void) { struct device_node *root; + const char *model = NULL; - if ((root = of_find_node_by_path("/")) && - !strncmp(of_get_property(root, "model", NULL), - "IBM,LongTrail", 13)) { - /* logical device 0 (KBC/Keyboard) */ - sio_fixup_irq("keyboard", 0, 1, 2); - /* select logical device 1 (KBC/Mouse) */ - sio_fixup_irq("mouse", 1, 12, 2); - } - of_node_put(root); + root = of_find_node_by_path("/"); + if (root) { + model = of_get_property(root, "model", NULL); + if (model && !strncmp(model,"IBM,LongTrail", 13)) { + /* logical device 0 (KBC/Keyboard) */ + sio_fixup_irq("keyboard", 0, 1, 2); + /* select logical device 1 (KBC/Mouse) */ + sio_fixup_irq("mouse", 1, 12, 2); + } + of_node_put(root); + } }