From c2c77fe8df3e0322a613ba1540910632ad14d96d Mon Sep 17 00:00:00 2001 From: Bernhard Walle Date: Sun, 28 Jan 2007 13:47:02 +0100 Subject: [IA64] Fix NULL-pointer dereference in ia64_machine_kexec() This patch fixes a NULL-pointer dereference in ia64_machine_kexec(). The variable ia64_kimage is set in machine_kexec_prepare() which is called from sys_kexec_load(). If kdump wasn't configured before, ia64_kimage is NULL. machine_kdump_on_init() passes ia64_kimage() to machine_kexec() which assumes a valid value. The patch also adds a few sanity checks for the image to simplify debugging of similar problems in future. Signed-off-by: Bernhard Walle Signed-off-by: Tony Luck --- arch/ia64/kernel/machine_kexec.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'arch/ia64/kernel/machine_kexec.c') diff --git a/arch/ia64/kernel/machine_kexec.c b/arch/ia64/kernel/machine_kexec.c index e51cd90..4f0f3b8 100644 --- a/arch/ia64/kernel/machine_kexec.c +++ b/arch/ia64/kernel/machine_kexec.c @@ -82,6 +82,7 @@ static void ia64_machine_kexec(struct unw_frame_info *info, void *arg) unsigned long vector; int ii; + BUG_ON(!image); if (image->type == KEXEC_TYPE_CRASH) { crash_save_this_cpu(); current->thread.ksp = (__u64)info->sw - 16; @@ -120,6 +121,7 @@ static void ia64_machine_kexec(struct unw_frame_info *info, void *arg) void machine_kexec(struct kimage *image) { + BUG_ON(!image); unw_init_running(ia64_machine_kexec, image); for(;;); } -- cgit v1.1