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Commit 7f1c9068 authored by Robin Getz's avatar Robin Getz Committed by Bryan Wu
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[Blackfin] arch: try to remove condition that causes double fault, by checking... 


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

Signed-off-by: default avatarRobin Getz <rgetz@blackfin.uclinux.org>
Signed-off-by: default avatarBryan Wu <cooloney@kernel.org>
parent 4d555630

arch/blackfin/kernel/traps.c

+24 −10
Original line number Diff line number Diff line
@@ -137,17 +137,30 @@ static void decode_address(char *buf, unsigned long address) 
				/* FLAT does not have its text aligned to the start of

				 * the map while FDPIC ELF does ...

				 */



				/* before we can check flat/fdpic, we need to

				 * 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);

						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)

					mmput(mm);



				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

	 * 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");

		if (current->comm >= (char *)FIXED_CODE_START)

			printk(KERN_NOTICE "COMM=%s PID=%d\n",