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Date: Tue, 4 Oct 2022 11:46:21 -0700 From: Andrew Morton <akpm@...ux-foundation.org> To: FirstName LastName <sethjenkins@...gle.com> Cc: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, Alexey Dobriyan <adobriyan@...il.com>, Vlastimil Babka <vbabka@...e.cz>, Jann Horn <jannh@...gle.com>, linux-mm@...ck.org, stable@...r.kernel.org Subject: Re: [PATCH] mm: /proc/pid/smaps_rollup: fix no vma's null-deref On Mon, 3 Oct 2022 18:45:31 -0400 FirstName LastName <sethjenkins@...gle.com> wrote: > From: Seth Jenkins <sethjenkins@...gle.com> > > Commit 258f669e7e88 ("mm: /proc/pid/smaps_rollup: convert to single value > seq_file") introduced a null-deref if there are no vma's in the task in > show_smaps_rollup. > > --- a/fs/proc/task_mmu.c > +++ b/fs/proc/task_mmu.c > @@ -969,7 +969,7 @@ static int show_smaps_rollup(struct seq_file *m, void *v) > vma = vma->vm_next; > } > > - show_vma_header_prefix(m, priv->mm->mmap->vm_start, > + show_vma_header_prefix(m, priv->mm->mmap ? priv->mm->mmap->vm_start : 0, > last_vma_end, 0, 0, 0, 0); > seq_pad(m, ' '); > seq_puts(m, "[rollup]\n"); The current mm tree is very different here. In fact the bug might not exist any more. Please take a look at the mm-stable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm? If no fixes are needed in mm-stable then I guess the process is to propose this patch to the stable tree maintainers.
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