From: FirstName LastName <sethjenkins@google.com>
To: Andrew Morton <akpm@linux-foundation.org>, linux-fsdevel@vger.kernel.org
Cc: linux-kernel@vger.kernel.org,
Alexey Dobriyan <adobriyan@gmail.com>,
Vlastimil Babka <vbabka@suse.cz>,
Seth Jenkins <sethjenkins@google.com>,
Jann Horn <jannh@google.com>,
linux-mm@kvack.org, stable@vger.kernel.org
Subject: [PATCH] mm: /proc/pid/smaps_rollup: fix no vma's null-deref
Date: Mon, 3 Oct 2022 18:45:31 -0400 [thread overview]
Message-ID: <20221003224531.1930646-1-sethjenkins@google.com> (raw)
From: Seth Jenkins <sethjenkins@google.com>
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")
Cc: stable@vger.kernel.org
Signed-off-by: Seth Jenkins <sethjenkins@google.com>
---
fs/proc/task_mmu.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 4e0023643f8b..1e7bbc0873a4 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -969,7 +969,7 @@ 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");
--
2.38.0.rc1.362.ged0d419d3c-goog
next reply other threads:[~2022-10-03 22:45 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-03 22:45 FirstName LastName [this message]
2022-10-04 12:53 ` Alexey Dobriyan
2022-10-04 18:46 ` Andrew Morton
2022-10-04 21:05 ` Seth Jenkins
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