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[95.25.158.125]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-5aebe333664sm667745e87.6.2026.06.30.08.26.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 30 Jun 2026 08:26:24 -0700 (PDT) From: Igor Putko To: sj@kernel.org Cc: akpm@linux-foundation.org, damon@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Igor Putko Subject: [PATCH] mm/damon/vaddr: check address space stability before VMA traversal Date: Tue, 30 Jun 2026 18:25:58 +0300 Message-ID: <20260630152558.24063-1-igorpetindev@gmail.com> X-Mailer: git-send-email 2.47.3 Precedence: bulk X-Mailing-List: damon@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit In __damon_va_three_regions(), the VMA tree is traversed without checking if the address space is stable. If the OOM reaper runs concurrently, it may mark the mm as MMF_UNSTABLE and leave empty markers in the maple tree. Add a check_stable_address_space(mm) call before iterating over the VMAs to avoid potential NULL pointer dereferences. Signed-off-by: Igor Putko --- mm/damon/vaddr.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/mm/damon/vaddr.c b/mm/damon/vaddr.c index 345b89b5d..e756ac147 100644 --- a/mm/damon/vaddr.c +++ b/mm/damon/vaddr.c @@ -11,6 +11,7 @@ #include #include #include +#include #include #include #include @@ -84,6 +85,9 @@ static int __damon_va_three_regions(struct mm_struct *mm, * If this is too slow, it can be optimised to examine the maple * tree gaps. */ + if (!check_stable_address_space(mm)) + return -EINVAL; + for_each_vma(vmi, vma) { unsigned long gap; -- 2.47.3