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[Blackfin] arch: try to remove condition that causes double fault, by checking current before it gets dereferenced 

Signed-off-by: Robin Getz <rgetz@blackfin.uclinux.org>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
This commit is contained in:
Robin Getz 2008-04-25 03:36:31 +08:00 committed by Bryan Wu
parent 4d55563070
commit 7f1c906808
1 changed files with 23 additions and 9 deletions
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32
arch/blackfin/kernel/traps.c
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@ -137,17 +137,30 @@ static void decode_address(char *buf, unsigned long address)
/* FLAT does not have its text aligned to the start of /* FLAT does not have its text aligned to the start of
* the map while FDPIC ELF does ... * the map while FDPIC ELF does ...
*/ */
if (current->mm &&
(address > current->mm->start_code) &&
(address < current->mm->end_code))
offset = address - current->mm->start_code;
else
offset = (address - vma->vm_start) + (vma->vm_pgoff << PAGE_SHIFT);
sprintf(buf, "<0x%p> [ %s + 0x%lx ]", /* before we can check flat/fdpic, we need to
(void *)address, name, offset); * make sure current is valid
*/
if ((unsigned long)current >= FIXED_CODE_START &&
!((unsigned long)current & 0x3)) {
if (current->mm &&
(address > current->mm->start_code) &&
(address < current->mm->end_code))
offset = address - current->mm->start_code;
else
offset = (address - vma->vm_start) +
(vma->vm_pgoff << PAGE_SHIFT);
sprintf(buf, "<0x%p> [ %s + 0x%lx ]",
(void *)address, name, offset);
} else
sprintf(buf, "<0x%p> [ %s vma:0x%lx-0x%lx]",
(void *)address, name,
vma->vm_start, vma->vm_end);
if (!in_atomic) if (!in_atomic)
mmput(mm); mmput(mm);
goto done; goto done;
} }
@ -658,7 +671,8 @@ void dump_bfin_process(struct pt_regs *fp)
/* Because we are crashing, and pointers could be bad, we check things /* Because we are crashing, and pointers could be bad, we check things
* pretty closely before we use them * pretty closely before we use them
*/ */
if (!((unsigned long)current & 0x3) && current->pid) { if ((unsigned long)current >= FIXED_CODE_START &&
!((unsigned long)current & 0x3) && current->pid) {
printk(KERN_NOTICE "CURRENT PROCESS:\n"); printk(KERN_NOTICE "CURRENT PROCESS:\n");
if (current->comm >= (char *)FIXED_CODE_START) if (current->comm >= (char *)FIXED_CODE_START)
printk(KERN_NOTICE "COMM=%s PID=%d\n", printk(KERN_NOTICE "COMM=%s PID=%d\n",