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authorMatthew Wilcox <matthew@wil.cx>2006-12-16 00:47:47 -0500
committerKyle McMartin <kyle@athena.road.mcmartin.ca>2007-02-17 00:51:25 -0500
commit9f15c82686251cd2b97ac6859de62959d3c4afe1 (patch)
tree6bacc1d1422fd9770d9b5f90417a804a8cad7ef1 /arch
parente6fc0449be45a0e7520da6a17a64520743b9aa20 (diff)
[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>
Diffstat (limited to 'arch')
-rw-r--r--arch/parisc/kernel/traps.c19
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)
187 187
188 if (!task) { 188 if (!task) {
189 unsigned long sp; 189 unsigned long sp;
190 struct pt_regs *r;
191 190
192HERE: 191HERE:
193 asm volatile ("copy %%r30, %0" : "=r"(sp)); 192 asm volatile ("copy %%r30, %0" : "=r"(sp));
194 r = kzalloc(sizeof(struct pt_regs), GFP_KERNEL); 193 {
195 if (!r) 194 struct pt_regs r;
196 return; 195
197 r->iaoq[0] = (unsigned long)&&HERE; 196 memset(&r, 0, sizeof(struct pt_regs));
198 r->gr[2] = (unsigned long)__builtin_return_address(0); 197 r.iaoq[0] = (unsigned long)&&HERE;
199 r->gr[30] = sp; 198 r.gr[2] = (unsigned long)__builtin_return_address(0);
200 unwind_frame_init(&info, current, r); 199 r.gr[30] = sp;
201 kfree(r); 200
201 unwind_frame_init(&info, current, &r);
202 }
202 } else { 203 } else {
203 unwind_frame_init_from_blocked_task(&info, task); 204 unwind_frame_init_from_blocked_task(&info, task);
204 } 205 }