From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 D3F91281353; Thu, 13 Feb 2025 14:36:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739457376; cv=none; b=e1Z0tn2VYXFj0ZpN0L+ta5MK9PXjC0HY1pwDKsaqHM25q8DxQpIynULRTRbE9c2zBmQFDx2KIzjQhF8XOWS/M62hd/65VAjO710aMc73/OPfsx/pdn/C8/HKfTtlhY5sWZLu61UuO4p80RPfnFqXwTmPXrlKiE/6FJ+sN103zB8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739457376; c=relaxed/simple; bh=PStrOwZoZqkk3Jv8nCdug3oXXOGSsB4Dfm2Rv17/dnI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=mV4NDgfKW69GOmUh16b/yatKU/dH+LGRZhm0eAV6SmTDrLPxCfN20zqx35uSSMt08tcE/wGi/QclpJJscp3uOi8XBQoxoFmDBAzsOkkjWtLpIPwPb65s25HY0jSLwYnImOnbQxLRR2G042rhsGtr7/y7zdC/WMMHX/SsMbNTL7Q= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=0m6ea9S+; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="0m6ea9S+" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D631FC4CED1; Thu, 13 Feb 2025 14:36:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1739457376; bh=PStrOwZoZqkk3Jv8nCdug3oXXOGSsB4Dfm2Rv17/dnI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=0m6ea9S+eOoHLLAklGf4oWduzOh2O/hcHddk4TB4uksVE9HCxdWrGXnQHo+BJLPOC 9V8vrm7ME4G5+RGRPqByAzOVehgtBc3G7UEtoBA+GlGgEctaWlDmklxD66PjQiQNjm zheLN5dhsbU43KL029p0XbQTYjrck3NxgndLFhcc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, =?UTF-8?q?Stefan=20D=C3=B6singer?= , Arend van Spriel , Kalle Valo , Sasha Levin Subject: [PATCH 6.12 060/422] wifi: brcmfmac: Check the return value of of_property_read_string_index() Date: Thu, 13 Feb 2025 15:23:29 +0100 Message-ID: <20250213142438.877113872@linuxfoundation.org> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250213142436.408121546@linuxfoundation.org> References: <20250213142436.408121546@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Stefan Dösinger [ Upstream commit 082d9e263af8de68f0c34f67b251818205160f6e ] Somewhen between 6.10 and 6.11 the driver started to crash on my MacBookPro14,3. The property doesn't exist and 'tmp' remains uninitialized, so we pass a random pointer to devm_kstrdup(). The crash I am getting looks like this: BUG: unable to handle page fault for address: 00007f033c669379 PF: supervisor read access in kernel mode PF: error_code(0x0001) - permissions violation PGD 8000000101341067 P4D 8000000101341067 PUD 101340067 PMD 1013bb067 PTE 800000010aee9025 Oops: Oops: 0001 [#1] SMP PTI CPU: 4 UID: 0 PID: 827 Comm: (udev-worker) Not tainted 6.11.8-gentoo #1 Hardware name: Apple Inc. MacBookPro14,3/Mac-551B86E5744E2388, BIOS 529.140.2.0.0 06/23/2024 RIP: 0010:strlen+0x4/0x30 Code: f7 75 ec 31 c0 c3 cc cc cc cc 48 89 f8 c3 cc cc cc cc 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa <80> 3f 00 74 14 48 89 f8 48 83 c0 01 80 38 00 75 f7 48 29 f8 c3 cc RSP: 0018:ffffb4aac0683ad8 EFLAGS: 00010202 RAX: 00000000ffffffea RBX: 00007f033c669379 RCX: 0000000000000001 RDX: 0000000000000cc0 RSI: 00007f033c669379 RDI: 00007f033c669379 RBP: 00000000ffffffea R08: 0000000000000000 R09: 00000000c0ba916a R10: ffffffffffffffff R11: ffffffffb61ea260 R12: ffff91f7815b50c8 R13: 0000000000000cc0 R14: ffff91fafefffe30 R15: ffffb4aac0683b30 FS: 00007f033ccbe8c0(0000) GS:ffff91faeed00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f033c669379 CR3: 0000000107b1e004 CR4: 00000000003706f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ? __die+0x23/0x70 ? page_fault_oops+0x149/0x4c0 ? raw_spin_rq_lock_nested+0xe/0x20 ? sched_balance_newidle+0x22b/0x3c0 ? update_load_avg+0x78/0x770 ? exc_page_fault+0x6f/0x150 ? asm_exc_page_fault+0x26/0x30 ? __pfx_pci_conf1_write+0x10/0x10 ? strlen+0x4/0x30 devm_kstrdup+0x25/0x70 brcmf_of_probe+0x273/0x350 [brcmfmac] Signed-off-by: Stefan Dösinger Acked-by: Arend van Spriel Signed-off-by: Kalle Valo Link: https://patch.msgid.link/20250106170958.3595-1-stefan@codeweavers.com Signed-off-by: Sasha Levin --- drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c index af930e34c21f8..22c064848124d 100644 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c @@ -97,13 +97,13 @@ void brcmf_of_probe(struct device *dev, enum brcmf_bus_type bus_type, /* Set board-type to the first string of the machine compatible prop */ root = of_find_node_by_path("/"); if (root && err) { - char *board_type; + char *board_type = NULL; const char *tmp; - of_property_read_string_index(root, "compatible", 0, &tmp); - /* get rid of '/' in the compatible string to be able to find the FW */ - board_type = devm_kstrdup(dev, tmp, GFP_KERNEL); + if (!of_property_read_string_index(root, "compatible", 0, &tmp)) + board_type = devm_kstrdup(dev, tmp, GFP_KERNEL); + if (!board_type) { of_node_put(root); return; -- 2.39.5