From nobody Sun Feb 8 21:41:55 2026 Received: from forward202b.mail.yandex.net (forward202b.mail.yandex.net [178.154.239.155]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B76F11922EF for ; Fri, 7 Mar 2025 14:41:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=178.154.239.155 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741358499; cv=none; b=VMGjWCqkpD1cB4bQ1a03/HN5Tu5ds42UQe2B/bMMxeDJ2n5aGB1sF1NislyXHAiQYJw1RPfYOOYDpYUo383oc8cdSupyJsjTQA5ILp/Xg4imL0alhe+E1oqU5shIjDBfQhFSdghjxZbIpBpPYMSWrpaZTeTmonnxY9Q1Lxshzmg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741358499; c=relaxed/simple; bh=9/YOTw+hwlAppabGdlW1lcCBKvn6z3aahdbUZH9TUDI=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=HrMTkyJeNke1SI/PWeGb0scTAKTGv5RTQjJNYonRcg9TEV7yF73urld2EZECdkHRjWncaeEIj+A6nqVq6b2/szU6lZxVQZDSgu3huCTlSuvHFaxs/n/ITxa3XUx3BWJWqpuajVzPPoX5Kof8+sF/7CaDuM71Qi3cVvnpDTjzgJ0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=yandex.ru; spf=pass smtp.mailfrom=yandex.ru; dkim=pass (1024-bit key) header.d=yandex.ru header.i=@yandex.ru header.b=Z02gXctY; arc=none smtp.client-ip=178.154.239.155 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=yandex.ru Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=yandex.ru Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=yandex.ru header.i=@yandex.ru header.b="Z02gXctY" Received: from forward102b.mail.yandex.net (forward102b.mail.yandex.net [IPv6:2a02:6b8:c02:900:1:45:d181:d102]) by forward202b.mail.yandex.net (Yandex) with ESMTPS id AA1E564D5A for ; Fri, 7 Mar 2025 17:35:16 +0300 (MSK) Received: from mail-nwsmtp-smtp-production-main-91.sas.yp-c.yandex.net (mail-nwsmtp-smtp-production-main-91.sas.yp-c.yandex.net [IPv6:2a02:6b8:c1e:3990:0:640:808c:0]) by forward102b.mail.yandex.net (Yandex) with ESMTPS id BFF3060D8C; Fri, 7 Mar 2025 17:35:08 +0300 (MSK) Received: by mail-nwsmtp-smtp-production-main-91.sas.yp-c.yandex.net (smtp/Yandex) with ESMTPSA id 0ZnwD2MLoSw0-vZ61V53i; Fri, 07 Mar 2025 17:35:08 +0300 X-Yandex-Fwd: 1 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yandex.ru; s=mail; t=1741358108; bh=8GeJNa6VgiFIh/C+Y/1mk9oen77NnBJDUbFFTfIyHuE=; h=Message-Id:Date:In-Reply-To:Cc:Subject:References:To:From; b=Z02gXctYbnuUHb0I7qaIZ4qtq9rEp9swVGI3+DiBUfZ+nlwb6jQr4EG36XSF1HEDz wOXNy+5hoD0bz0Az19LccEKlnjELGv4OxD7k0N7d3TlRI4CS6kWrlyKokOqD5OeFV0 vPvGR75YFOrZhAI1wQneBAkF3H0NB5A0FyqSwBmE= Authentication-Results: mail-nwsmtp-smtp-production-main-91.sas.yp-c.yandex.net; dkim=pass header.i=@yandex.ru From: Andrey Tsygunka To: markus.elfring@web.de Cc: aitsygunka@yandex.ru, arnd@arndb.de, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, lvc-project@linuxtesting.org Subject: [PATCH v2] misc: sram: Fix NULL pointer dereference in sram_probe Date: Fri, 7 Mar 2025 17:34:42 +0300 Message-Id: <20250307143442.4125844-1-aitsygunka@yandex.ru> X-Mailer: git-send-email 2.25.1 In-Reply-To: <84969aba-67ba-4990-9065-6b55ce26ff92@web.de> References: <84969aba-67ba-4990-9065-6b55ce26ff92@web.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add a check for the return value from platform_get_resource() call to be NULL. If the passed device-tree contains a node for sram-device without a specified '' property value, for example: sram: sram@5c0000000 { compatible =3D "nvidia,tegra186-sysram"; }; and the of_device_id[] '.data' element contains a sram_config* with '.map_only_reserved =3D true' property, we get the error: Unable to handle kernel NULL pointer dereference at virtual address 0000000= 000000000 Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.1.96 #1 Hardware name: linux,dummy-virt (DT) Call trace: sram_probe+0x134/0xd30 platform_probe+0x94/0x130 really_probe+0x124/0x580 __driver_probe_device+0xd0/0x1f0 driver_probe_device+0x50/0x1c0 __device_attach_driver+0x140/0x220 bus_for_each_drv+0xbc/0x130 __device_attach+0xec/0x2c0 device_initial_probe+0x24/0x40 bus_probe_device+0xd8/0xe0 device_add+0x67c/0xc80 of_device_add+0x58/0x80 of_platform_device_create_pdata+0xd0/0x1b0 of_platform_bus_create+0x27c/0x6f0 of_platform_populate+0xac/0x1d0 of_platform_default_populate_init+0x10c/0x130 do_one_initcall+0xdc/0x510 kernel_init_freeable+0x43c/0x4d8 kernel_init+0x2c/0x1e0 ret_from_fork+0x10/0x20 Fixes: 444b0111f3bc ("misc: sram: use devm_platform_ioremap_resource_wc()") Signed-off-by: Andrey Tsygunka --- v2: Description changed based on comments from Markus Elfring=20 at https://lore.kernel.org/linux-kernel/84969aba-67ba-4990-9065-6b55ce26ff9= 2@web.de/, added tag 'Fixes', removed useless information from backtrace. drivers/misc/sram.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/misc/sram.c b/drivers/misc/sram.c index e5069882457e..c8ba8ebd4364 100644 --- a/drivers/misc/sram.c +++ b/drivers/misc/sram.c @@ -410,8 +410,13 @@ static int sram_probe(struct platform_device *pdev) if (IS_ERR(clk)) return PTR_ERR(clk); =20 - ret =3D sram_reserve_regions(sram, - platform_get_resource(pdev, IORESOURCE_MEM, 0)); + res =3D platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (unlikely(res =3D=3D NULL)) { + dev_err(&pdev->dev, "invalid resource\n"); + return -EINVAL; + } + + ret =3D sram_reserve_regions(sram, res); if (ret) return ret; =20 --=20 2.25.1