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 DE0BA335561; Fri, 9 Jan 2026 11:59:18 +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=1767959958; cv=none; b=KwnzbmuBBgf7Oph28qt2iw4eVScHEVBGW5lrbvsZ2OUsVRtLcVzGzO/gHEbYX3kt9uAxb8Xb8ZsR6XJhapo4qjFnFKumjcRbLDa3/wgLs4aLCw0ePso1V/WxGlQnfwwmYg6Ado4YtcZu88Gb58iCwEle3ERJ2g6WTzGyUavgpOw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767959958; c=relaxed/simple; bh=tsut64ycdIVvS0RDKjUxmFT3Kh/4xIo3vT9GQnbzJ1I=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=hMNWAJZyM+JuTgRtMVqunw7YPuwrPaR+flKESbmy5ogq/be0MpbjFuRR1g4nJmipI1EVmmi9ClCGuIFmuG7d6D1i7kAqD9dReAc8b4U3ZTWzhNGlLFAksyaMAX1wcT3+zzxXH4SXi8pVIBCj6jpbZc2DF/dF5Wy12QmfYsLOW8o= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=HoPzENm4; 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="HoPzENm4" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6A833C4CEF1; Fri, 9 Jan 2026 11:59:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1767959958; bh=tsut64ycdIVvS0RDKjUxmFT3Kh/4xIo3vT9GQnbzJ1I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=HoPzENm4aUzivsx6t9IxkEdDZG7fxmVRcQENfue+7sYSkN13/AmC59aYdIXWV9S1A IoJAxZz2ABtomRnuTqzO6datvh/z00sZKRkxgLzKF8tRq4SVvm1k5KFlsC+jVbCFrQ s9LjhQ7KAAtkEU1Axu+jsM2Rx7WNBz3jp6m2KPCk= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, sparkhuang , Charles Keepax , Mark Brown , Sasha Levin Subject: [PATCH 6.6 235/737] regulator: core: Protect regulator_supply_alias_list with regulator_list_mutex Date: Fri, 9 Jan 2026 12:36:14 +0100 Message-ID: <20260109112142.838642028@linuxfoundation.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260109112133.973195406@linuxfoundation.org> References: <20260109112133.973195406@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: sparkhuang [ Upstream commit 0cc15a10c3b4ab14cd71b779fd5c9ca0cb2bc30d ] regulator_supply_alias_list was accessed without any locking in regulator_supply_alias(), regulator_register_supply_alias(), and regulator_unregister_supply_alias(). Concurrent registration, unregistration and lookups can race, leading to: 1 use-after-free if an alias entry is removed while being read, 2 duplicate entries when two threads register the same alias, 3 inconsistent alias mappings observed by consumers. Protect all traversals, insertions and deletions on regulator_supply_alias_list with the existing regulator_list_mutex. Fixes: a06ccd9c3785f ("regulator: core: Add ability to create a lookup alias for supply") Signed-off-by: sparkhuang Reviewed-by: Charles Keepax Link: https://patch.msgid.link/20251127025716.5440-1-huangshaobo3@xiaomi.com Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- drivers/regulator/core.c | 32 ++++++++++++++++++++------------ 1 file changed, 20 insertions(+), 12 deletions(-) diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index 465f4f870162f..23cdf220ca7db 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -1970,6 +1970,7 @@ static void regulator_supply_alias(struct device **dev, const char **supply) { struct regulator_supply_alias *map; + mutex_lock(®ulator_list_mutex); map = regulator_find_supply_alias(*dev, *supply); if (map) { dev_dbg(*dev, "Mapping supply %s to %s,%s\n", @@ -1978,6 +1979,7 @@ static void regulator_supply_alias(struct device **dev, const char **supply) *dev = map->alias_dev; *supply = map->alias_supply; } + mutex_unlock(®ulator_list_mutex); } static int regulator_match(struct device *dev, const void *data) @@ -2456,22 +2458,26 @@ int regulator_register_supply_alias(struct device *dev, const char *id, const char *alias_id) { struct regulator_supply_alias *map; + struct regulator_supply_alias *new_map; - map = regulator_find_supply_alias(dev, id); - if (map) - return -EEXIST; - - map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL); - if (!map) + new_map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL); + if (!new_map) return -ENOMEM; - map->src_dev = dev; - map->src_supply = id; - map->alias_dev = alias_dev; - map->alias_supply = alias_id; - - list_add(&map->list, ®ulator_supply_alias_list); + mutex_lock(®ulator_list_mutex); + map = regulator_find_supply_alias(dev, id); + if (map) { + mutex_unlock(®ulator_list_mutex); + kfree(new_map); + return -EEXIST; + } + new_map->src_dev = dev; + new_map->src_supply = id; + new_map->alias_dev = alias_dev; + new_map->alias_supply = alias_id; + list_add(&new_map->list, ®ulator_supply_alias_list); + mutex_unlock(®ulator_list_mutex); pr_info("Adding alias for supply %s,%s -> %s,%s\n", id, dev_name(dev), alias_id, dev_name(alias_dev)); @@ -2491,11 +2497,13 @@ void regulator_unregister_supply_alias(struct device *dev, const char *id) { struct regulator_supply_alias *map; + mutex_lock(®ulator_list_mutex); map = regulator_find_supply_alias(dev, id); if (map) { list_del(&map->list); kfree(map); } + mutex_unlock(®ulator_list_mutex); } EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias); -- 2.51.0