The patch titled
Subject: mm: /proc/pid/smaps_rollup: fix no vma's null-deref
has been added to the -mm mm-hotfixes-unstable branch. Its filename is
mm-proc-pid-smaps_rollup-fix-no-vmas-null-deref.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-proc-pid-smaps_rollup-fix-no-vmas-null-deref.patch
This patch will later appear in the mm-hotfixes-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Seth Jenkins <sethjenkins@xxxxxxxxxx>
Subject: mm: /proc/pid/smaps_rollup: fix no vma's null-deref
Date: Mon, 3 Oct 2022 18:45:31 -0400
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.
Link: https://lkml.kernel.org/r/20221003224531.1930646-1-sethjenkins@xxxxxxxxxx
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>
Cc: Jann Horn <jannh@xxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/proc/task_mmu.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/proc/task_mmu.c~mm-proc-pid-smaps_rollup-fix-no-vmas-null-deref
+++ a/fs/proc/task_mmu.c
@@ -969,7 +969,7 @@ 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 -mm which might be from sethjenkins@xxxxxxxxxx are
mm-proc-pid-smaps_rollup-fix-no-vmas-null-deref.patch
