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| author | Matthew Wilcox <matthew@wil.cx> | 2006-12-15 22:47:47 -0700 |
|---|---|---|
| committer | Kyle McMartin <kyle@athena.road.mcmartin.ca> | 2007-02-17 00:51:25 -0500 |
| commit | 9f15c82686251cd2b97ac6859de62959d3c4afe1 (patch) | |
| tree | 6bacc1d1422fd9770d9b5f90417a804a8cad7ef1 | |
| parent | e6fc0449be45a0e7520da6a17a64520743b9aa20 (diff) | |
| download | kernel-common-9f15c82686251cd2b97ac6859de62959d3c4afe1.tar.gz kernel-common-9f15c82686251cd2b97ac6859de62959d3c4afe1.tar.bz2 kernel-common-9f15c82686251cd2b97ac6859de62959d3c4afe1.zip | |
[PARISC] Fix show_stack() when we can't kmalloc
show_stack() was calling kzalloc() to allocate a struct pt_regs.
This meant that *really* early stack dumps would cause a null pointer
dereference. x86_64 allocates its pt_regs on the stack, so do the same.
Kyle actually committed this exact patch to CVS on
Wed Jul 26 14:32:39 2006 UTC, and never moved it across to git.
Bad Kyle.
Signed-off-by: Matthew Wilcox <matthew@wil.cx>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
| -rw-r--r-- | arch/parisc/kernel/traps.c | 19 |
1 files changed, 10 insertions, 9 deletions
diff --git a/arch/parisc/kernel/traps.c b/arch/parisc/kernel/traps.c index fa0811295acc..949722540864 100644 --- a/arch/parisc/kernel/traps.c +++ b/arch/parisc/kernel/traps.c @@ -187,18 +187,19 @@ void show_stack(struct task_struct *task, unsigned long *s) if (!task) { unsigned long sp; - struct pt_regs *r; HERE: asm volatile ("copy %%r30, %0" : "=r"(sp)); - r = kzalloc(sizeof(struct pt_regs), GFP_KERNEL); - if (!r) - return; - r->iaoq[0] = (unsigned long)&&HERE; - r->gr[2] = (unsigned long)__builtin_return_address(0); - r->gr[30] = sp; - unwind_frame_init(&info, current, r); - kfree(r); + { + struct pt_regs r; + + memset(&r, 0, sizeof(struct pt_regs)); + r.iaoq[0] = (unsigned long)&&HERE; + r.gr[2] = (unsigned long)__builtin_return_address(0); + r.gr[30] = sp; + + unwind_frame_init(&info, current, &r); + } } else { unwind_frame_init_from_blocked_task(&info, task); } |