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parisc: fix expand_stack() conversion 

commit ea3f827287 upstream.

In commit 8d7071af89 ("mm: always expand the stack with the mmap write
lock held") I tried to deal with the remaining odd page fault handling
cases.  The oddest one is ia64, which has stacks that grow both up and
down.  And because ia64 was _so_ odd, I asked people to verify the end
result.

But a close second oddity is parisc, which is the only one that has a
main stack growing up (our "CONFIG_STACK_GROWSUP" config option).  But
it looked obvious enough that I didn't worry about it.

I should have worried a bit more.  Not because it was particularly
complex, but because I just used the wrong variable name.

The previous vma isn't called "prev", it's called "prev_vma".  Blush.

Fixes: 8d7071af89 ("mm: always expand the stack with the mmap write lock held")
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Linus Torvalds 2023-06-29 23:04:57 -07:00 committed by Greg Kroah-Hartman
parent 0a1da2dde4
commit 4a1db15878
1 changed files with 1 additions and 1 deletions
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2
arch/parisc/mm/fault.c
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@ -289,7 +289,7 @@ void do_page_fault(struct pt_regs *regs, unsigned long code,
mmap_read_lock(mm);
vma = find_vma_prev(mm, address, &prev_vma);
if (!vma || address < vma->vm_start) {
if (!prev || !(prev->vm_flags & VM_GROWSUP))
if (!prev_vma || !(prev_vma->vm_flags & VM_GROWSUP))
goto bad_area;
vma = expand_stack(mm, address);
if (!vma)