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Thu, 04 Jun 2026 00:36:21 -0700 (PDT) From: Wandun Chen To: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Cc: robh@kernel.org, saravanak@kernel.org Subject: [PATCH 1/2] of: reserved_mem: avoid stack buffer overflow in fdt_scan_reserved_mem() Date: Thu, 4 Jun 2026 15:36:10 +0800 Message-ID: <20260604073611.3954433-2-chenwandun1@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260604073611.3954433-1-chenwandun1@gmail.com> References: <20260604073611.3954433-1-chenwandun1@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Wandun Chen Sashiko found a potential stack buffer overflow in fdt_scan_reserved_mem() due to missing bounds checking on dynamic_nodes_cnt [1]. Fix this by adding bounds check. Link: https://sashiko.dev/#/patchset/20260604015332.3669384-1-chenwandun1%40gmail.com?part=1 [1] Signed-off-by: Wandun Chen --- drivers/of/of_reserved_mem.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c index ce1d5530ec0f..27dc98aa9bf9 100644 --- a/drivers/of/of_reserved_mem.c +++ b/drivers/of/of_reserved_mem.c @@ -346,6 +346,12 @@ int __init fdt_scan_reserved_mem(void) err = __reserved_mem_reserve_reg(child, uname); if (!err) count++; + + if (dynamic_nodes_cnt >= MAX_RESERVED_REGIONS) { + pr_err_once("Reserved memory: reached MAX_RESERVED_REGIONS(%d)\n", + MAX_RESERVED_REGIONS); + continue; + } /* * Save the nodes for the dynamically-placed regions * into an array which will be used for allocation right -- 2.43.0