From patchwork Mon Aug 14 07:24:34 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Biju Das X-Patchwork-Id: 13352441 X-Patchwork-Delegate: geert@linux-m68k.org Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C098BC001DB for ; Mon, 14 Aug 2023 07:25:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232569AbjHNHY6 (ORCPT ); Mon, 14 Aug 2023 03:24:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36286 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233826AbjHNHYr (ORCPT ); Mon, 14 Aug 2023 03:24:47 -0400 Received: from relmlie6.idc.renesas.com (relmlor2.renesas.com [210.160.252.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 2D58FE71; Mon, 14 Aug 2023 00:24:46 -0700 (PDT) X-IronPort-AV: E=Sophos;i="6.01,171,1684767600"; d="scan'208";a="176575845" Received: from unknown (HELO relmlir6.idc.renesas.com) ([10.200.68.152]) by relmlie6.idc.renesas.com with ESMTP; 14 Aug 2023 16:24:45 +0900 Received: from localhost.localdomain (unknown [10.226.92.104]) by relmlir6.idc.renesas.com (Postfix) with ESMTP id 29B47419AC62; Mon, 14 Aug 2023 16:24:42 +0900 (JST) From: Biju Das To: Linus Walleij Cc: Biju Das , Geert Uytterhoeven , Lad Prabhakar , Fabrizio Castro , linux-renesas-soc@vger.kernel.org, linux-gpio@vger.kernel.org, stable@kernel.org, Chris Paterson Subject: [PATCH 1/3] pinctrl: renesas: rzg2l: Fix NULL pointer dereference in rzg2l_dt_subnode_to_map() Date: Mon, 14 Aug 2023 08:24:34 +0100 Message-Id: <20230814072436.3757-2-biju.das.jz@bp.renesas.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230814072436.3757-1-biju.das.jz@bp.renesas.com> References: <20230814072436.3757-1-biju.das.jz@bp.renesas.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-renesas-soc@vger.kernel.org Fix the below random NULL pointer crash during boot by serializing pinctrl group and function creation/remove calls in rzg2l_dt_subnode_to_map() with mutex lock. Crash logs: [ 15.310036] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 [ 15.354291] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 [ 15.870714] [0000000000000000] pgd=0000000000000000, p4d=0000000000000000 [ 15.939989] Internal error: Oops: 0000000096000004 2 PREEMPT SMP [ 15.946285] Modules linked in: drm_shmem_helper rzg2l_mipi_dsi videobuf2_common display_connector gpu_sched mc drm_kms_helper rcar_fcp drm rcar_canfd snd_soc_wm8978 rtc_isl1208 can_dev rzg2l_adc snd_soc_rz_ssi renesas_rpc_if spi_rspi backlight ipv6 [ 15.969077] CPU: 1 PID: 117 Comm: systemd-udevd Tainted: G D 6.5.0-rc4-next-20230801-00013-gd1819ab30a54 #986 [ 15.980351] Hardware name: Renesas SMARC EVK based on r9a07g054l2 (DT) [ 15.986857] pstate: 40400005 (nZcv daif +PAN UAO -TCO -DIT -SSBS BTYPE=-) [ 15.993797] pc : __pi_strcmp+0x20/0x140 [ 15.997647] lr : pinmux_func_name_to_selector+0x68/0xa4 [ 16.002876] sp : ffff800082d9b5a0 [ 16.006210] x29: ffff800082d9b5a0 x28: 0000000000000002 x27: ffff00000cda7080 [ 16.013338] x26: 0000000000000002 x25: ffff00000a1f26c0 x24: ffff00000cda7080 [ 16.020456] x23: ffff800081224960 x22: ffff00007fc2e598 x21: 000000000000000c [ 16.027571] x20: ffff00000b6c8840 x19: 000000000000000b x18: 0000000000000002 [ 16.034686] x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 [ 16.041799] x14: 0000000000000001 x13: 0000000000068a68 x12: 0000000000000040 [ 16.048913] x11: ffff00000b092ff8 x10: 0000ffff803d1a68 x9 : ffff00000b6c8888 [ 16.056028] x8 : 0101010101010101 x7 : 0000000000000000 x6 : 0000000000000000 [ 16.063142] x5 : ffff00000b092ff8 x4 : ffff00000b093078 x3 : 0000000000000000 [ 16.070256] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff00007fc2e598 [ 16.077370] Call trace: [ 16.079807] __pi_strcmp+0x20/0x140 [ 16.083296] pinmux_generic_add_function+0x34/0xcc [ 16.088077] rzg2l_dt_subnode_to_map+0x314/0x44c [ 16.092682] rzg2l_dt_node_to_map+0x164/0x194 [ 16.097025] pinctrl_dt_to_map+0x218/0x37c [ 16.101107] create_pinctrl+0x70/0x3d8 Fixes: c4c4637eb57f ("pinctrl: renesas: Add RZ/G2L pin and gpio controller driver") Cc: stable@kernel.org Tested-by: Chris Paterson Signed-off-by: Biju Das --- drivers/pinctrl/renesas/pinctrl-rzg2l.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/pinctrl/renesas/pinctrl-rzg2l.c b/drivers/pinctrl/renesas/pinctrl-rzg2l.c index 4f34f8f24bde..8a14cbb56449 100644 --- a/drivers/pinctrl/renesas/pinctrl-rzg2l.c +++ b/drivers/pinctrl/renesas/pinctrl-rzg2l.c @@ -11,6 +11,7 @@ #include #include #include +#include #include #include #include @@ -153,6 +154,7 @@ struct rzg2l_pinctrl { unsigned int hwirq[RZG2L_TINT_MAX_INTERRUPT]; spinlock_t lock; + struct mutex mutex; /* serialize adding groups and functions */ }; static const unsigned int iolh_groupa_mA[] = { 2, 4, 8, 12 }; @@ -362,10 +364,12 @@ static int rzg2l_dt_subnode_to_map(struct pinctrl_dev *pctldev, name = np->name; } + mutex_lock(&pctrl->mutex); /* Register a single pin group listing all the pins we read from DT */ gsel = pinctrl_generic_add_group(pctldev, name, pins, num_pinmux, NULL); if (gsel < 0) { ret = gsel; + mutex_unlock(&pctrl->mutex); goto done; } @@ -380,6 +384,8 @@ static int rzg2l_dt_subnode_to_map(struct pinctrl_dev *pctldev, goto remove_group; } + mutex_unlock(&pctrl->mutex); + maps[idx].type = PIN_MAP_TYPE_MUX_GROUP; maps[idx].data.mux.group = name; maps[idx].data.mux.function = name; @@ -391,6 +397,7 @@ static int rzg2l_dt_subnode_to_map(struct pinctrl_dev *pctldev, remove_group: pinctrl_generic_remove_group(pctldev, gsel); + mutex_unlock(&pctrl->mutex); done: *index = idx; kfree(configs); @@ -1503,6 +1510,7 @@ static int rzg2l_pinctrl_probe(struct platform_device *pdev) spin_lock_init(&pctrl->lock); spin_lock_init(&pctrl->bitmap_lock); + mutex_init(&pctrl->mutex); platform_set_drvdata(pdev, pctrl);