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mm: /proc/pid/smaps_rollup: fix no vma's null-deref
Commit258f669e7e
("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:258f669e7e
("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>
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@ -951,7 +951,7 @@ static int show_smaps_rollup(struct seq_file *m, void *v)
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vma = vma->vm_next;
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}
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show_vma_header_prefix(m, priv->mm->mmap->vm_start,
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show_vma_header_prefix(m, priv->mm->mmap ? priv->mm->mmap->vm_start : 0,
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last_vma_end, 0, 0, 0, 0);
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seq_pad(m, ' ');
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seq_puts(m, "[rollup]\n");
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