Patch "mm: /proc/pid/smaps_rollup: fix no vma's null-deref" has been added to the 5.10-stable tree

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This is a note to let you know that I've just added the patch titled

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

to the 5.10-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     mm-proc-pid-smaps_rollup-fix-no-vma-s-null-deref.patch
and it can be found in the queue-5.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From sethjenkins@xxxxxxxxxx  Thu Oct 27 17:53:55 2022
From: Seth Jenkins <sethjenkins@xxxxxxxxxx>
Date: Thu, 27 Oct 2022 11:36:52 -0400
Subject: mm: /proc/pid/smaps_rollup: fix no vma's null-deref
To: stable@xxxxxxxxxxxxxxx
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Seth Jenkins <sethjenkins@xxxxxxxxxx>, Alexey Dobriyan <adobriyan@xxxxxxxxx>
Message-ID: <20221027153652.899495-1-sethjenkins@xxxxxxxxxx>

From: Seth Jenkins <sethjenkins@xxxxxxxxxx>

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 <sethjenkins@xxxxxxxxxx>
Reviewed-by: Alexey Dobriyan <adobriyan@xxxxxxxxx>
Tested-by: Alexey Dobriyan <adobriyan@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 fs/proc/task_mmu.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -951,7 +951,7 @@ static int show_smaps_rollup(struct seq_
 		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");


Patches currently in stable-queue which might be from sethjenkins@xxxxxxxxxx are

queue-5.10/mm-proc-pid-smaps_rollup-fix-no-vma-s-null-deref.patch



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