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| author | Bernhard Walle <bwalle@suse.de> | 2007-01-28 13:47:02 +0100 |
|---|---|---|
| committer | Tony Luck <tony.luck@intel.com> | 2007-02-05 14:06:44 -0800 |
| commit | c2c77fe8df3e0322a613ba1540910632ad14d96d (patch) | |
| tree | 38a6da2e1995b3050e32947019b1166e380c1ec5 | |
| parent | 87f76d3aafe5b5e0a1d6d857088a0263b35afa6b (diff) | |
| download | linux-c2c77fe8df3e0322a613ba1540910632ad14d96d.tar.gz linux-c2c77fe8df3e0322a613ba1540910632ad14d96d.tar.bz2 linux-c2c77fe8df3e0322a613ba1540910632ad14d96d.zip | |
[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 <bwalle@suse.de>
Signed-off-by: Tony Luck <tony.luck@intel.com>
| -rw-r--r-- | arch/ia64/kernel/crash.c | 5 | ||||
| -rw-r--r-- | arch/ia64/kernel/machine_kexec.c | 2 |
2 files changed, 7 insertions, 0 deletions
diff --git a/arch/ia64/kernel/crash.c b/arch/ia64/kernel/crash.c index 2018e624f5e2..9d92097ce96d 100644 --- a/arch/ia64/kernel/crash.c +++ b/arch/ia64/kernel/crash.c @@ -118,6 +118,11 @@ machine_crash_shutdown(struct pt_regs *pt) static void machine_kdump_on_init(void) { + if (!ia64_kimage) { + printk(KERN_NOTICE "machine_kdump_on_init(): " + "kdump not configured\n"); + return; + } local_irq_disable(); kexec_disable_iosapic(); machine_kexec(ia64_kimage); diff --git a/arch/ia64/kernel/machine_kexec.c b/arch/ia64/kernel/machine_kexec.c index e51cd904a23e..4f0f3b8c1ee2 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(;;); } |