Commit 2ad3deb0 authored by Seth Jenkins's avatar Seth Jenkins Committed by Lipeng Sang
Browse files

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

stable inclusion
from stable-v5.10.152
commit a50ed2d28727ff605d95fb9a53be8ff94e8eaaf4
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I73HJ0

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=a50ed2d28727ff605d95fb9a53be8ff94e8eaaf4



--------------------------------

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: default avatarSeth Jenkins <sethjenkins@google.com>
Reviewed-by: default avatarAlexey Dobriyan <adobriyan@gmail.com>
Tested-by: default avatarAlexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: default avatarLipeng Sang <sanglipeng1@jd.com>
parent 3bd4ac22

fs/proc/task_mmu.c

+1 −1
Original line number Diff line number Diff line
@@ -959,7 +959,7 @@ 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");