From 33fc9e26b7cb39f0d4219c875a2451802249c225 Mon Sep 17 00:00:00 2001 From: Seth Jenkins Date: Thu, 27 Oct 2022 11:36:52 -0400 Subject: [PATCH] mm: /proc/pid/smaps_rollup: fix no vma's null-deref 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. Fixes: 258f669e7e88 ("mm: /proc/pid/smaps_rollup: convert to single value seq_file") Signed-off-by: Seth Jenkins Reviewed-by: Alexey Dobriyan Tested-by: Alexey Dobriyan Signed-off-by: Greg Kroah-Hartman --- fs/proc/task_mmu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index d9c07ee..c3b7674 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -951,7 +951,7 @@ 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"); -- 2.7.4