Commit 6bb87693 authored Oct 27, 2022 by Seth Jenkins Committed by Greg Kroah-Hartman Oct 29, 2022

mm: /proc/pid/smaps_rollup: fix no vma's null-deref



Commit 258f669e ("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.

Fixes: 258f669e ("mm: /proc/pid/smaps_rollup: convert to single value seq_file")
Signed-off-by: Seth Jenkins <sethjenkins@google.com>
Reviewed-by: Alexey Dobriyan <adobriyan@gmail.com>
Tested-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent a351077e

fs/proc/task_mmu.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -884,7 +884,7 @@ static int show_smaps_rollup(struct seq_file m, void v)
		last_vma_end = vma->vm_end;
		}

		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");