From: Hui Zhu <hui.zhu@linux.dev>
To: Andrew Morton <akpm@linux-foundation.org>,
"Liam R . Howlett" <Liam.Howlett@oracle.com>,
Lorenzo Stoakes <lorenzo.stoakes@oracle.com>,
Vlastimil Babka <vbabka@kernel.org>, Jann Horn <jannh@google.com>,
Pedro Falcato <pfalcato@suse.de>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Cc: Hui Zhu <zhuhui@kylinos.cn>
Subject: [PATCH mm-unstable 0/2] mm/mmap: fix crashes in dup_mmap() error path
Date: Wed, 4 Mar 2026 15:00:55 +0800 [thread overview]
Message-ID: <cover.1772607155.git.zhuhui@kylinos.cn> (raw)
From: Hui Zhu <zhuhui@kylinos.cn>
This series fixes two potential kernel panics in the dup_mmap() error
path triggered during fork failures:
Fix Use-After-Free: Moves vma_iter_free() to the end of the cleanup
block to ensure the iterator remains valid during rollback.
Fix NULL Dereference: Adds a check for vma_next() results to prevent
crashing when the maple tree is empty.
Hui Zhu (2):
mm/mmap: fix Use-After-Free of vma_iterator in dup_mmap() error path
mm/mmap: fix NULL pointer dereference in dup_mmap() error handling
mm/mmap.c | 34 ++++++++++++++++++++--------------
1 file changed, 20 insertions(+), 14 deletions(-)
--
2.43.0
next reply other threads:[~2026-03-04 7:01 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-04 7:00 Hui Zhu [this message]
2026-03-04 7:00 ` [PATCH mm-unstable 1/2] mm/mmap: fix Use-After-Free of vma_iterator " Hui Zhu
2026-03-04 7:00 ` [PATCH mm-unstable 2/2] mm/mmap: fix NULL pointer dereference in dup_mmap() error handling Hui Zhu
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