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 4.19-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-4.19 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
@@ -843,7 +843,7 @@ static int show_smaps_rollup(struct seq_
last_vma_end = vma->vm_end;
}
- 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-4.19/mm-proc-pid-smaps_rollup-fix-no-vma-s-null-deref.patch
