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

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Commit 258f669e7e ("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>
This commit is contained in:
Seth Jenkins 2022-10-27 11:36:52 -04:00 committed by Greg Kroah-Hartman
parent 31b1570677
commit a50ed2d287
1 changed files with 1 additions and 1 deletions
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2
fs/proc/task_mmu.c
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@ -951,7 +951,7 @@ static int show_smaps_rollup(struct seq_file *m, void *v)
vma = vma->vm_next; 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); last_vma_end, 0, 0, 0, 0);
seq_pad(m, ' '); seq_pad(m, ' ');
seq_puts(m, "[rollup]\n"); seq_puts(m, "[rollup]\n");