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 EB69936C9CE for ; Sat, 28 Feb 2026 18:10:20 +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=1772302221; cv=none; b=CA+zbRYkXTKo9a0DJYsG8O3WLPUEb2LVNydmH91fh/LLmINDdmENwmHooMQNXu+4z0mkrpggsnwX+yHC0nZ6F1vXFnzGm8xbhML5s9kQWnVlN4URHEFwgpqkD84n+RRJlTIUzqakBUOJz5Wuizit3TEJHZqLXh0Os4FlMlir70o= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772302221; c=relaxed/simple; bh=JMife9VSAj8Kn42m2xZZTbLGNUzXXLYkp29/1qev2Vk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=LpJAxtTsaTaStdLJqoptoz80IXTP9M6KqJKr/f1MdhbGcta9rE9zG307+QwPFVCyLkv6cChEJayCU5vmng06z67hJuykC5aEKG01IV0I1x+nhw2ClI5z+cHKJTQ8mDkV4lgAI00NQj9zR5LAbTYVtOfJd31FNkF9ybKOp8OyQHI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=bhHuwGBQ; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="bhHuwGBQ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 469CEC19423; Sat, 28 Feb 2026 18:10:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772302220; bh=JMife9VSAj8Kn42m2xZZTbLGNUzXXLYkp29/1qev2Vk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bhHuwGBQun+4oN/z7vb9f/MxE927f6jFmV3/VJdgJ6Hamwnl3kt77xJ6+qDVeSCvU sdkrtQJwfJ1YOs8JqHF2+HntONxeZ3bz2WrXo5Udvh5e1CX0iOg8qPuXsb1oIjIMNt gVy3b49TFvK7Dch43qdFx2lvfPY18xXmxNPy+tVs3XdEYDm2wRHY73D2ugLmNMQ9Pu 9DtvILRWC7NnSdiHxEBVZINTJZp60EWb3dGTE+Y/wOgD7vuxxx8ceR0DF7mNO65As9 NyPymR6K2OUOrmRdJ8JvtRi9BUVWufUS8kmVqquKo+ToAg4ir97iKHBdffShHvoKCh m6UMNNoxo2PMg== From: Sasha Levin To: patches@lists.linux.dev Cc: Chaitanya Mishra , Rui Miguel Silva , Greg Kroah-Hartman , Sasha Levin Subject: [PATCH 6.6 228/283] staging: greybus: lights: avoid NULL deref Date: Sat, 28 Feb 2026 13:06:10 -0500 Message-ID: <20260228180709.1583486-228-sashal@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260228180709.1583486-1-sashal@kernel.org> References: <20260228180709.1583486-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit From: Chaitanya Mishra [ Upstream commit efcffd9a6ad8d190651498d5eda53bfc7cf683a7 ] gb_lights_light_config() stores channel_count before allocating the channels array. If kcalloc() fails, gb_lights_release() iterates the non-zero count and dereferences light->channels, which is NULL. Allocate channels first and only then publish channels_count so the cleanup path can't walk a NULL pointer. Fixes: 2870b52bae4c ("greybus: lights: add lights implementation") Link: https://lore.kernel.org/all/20260108103700.15384-1-chaitanyamishra.ai@gmail.com/ Reviewed-by: Rui Miguel Silva Signed-off-by: Chaitanya Mishra Link: https://patch.msgid.link/20260108151254.81553-1-chaitanyamishra.ai@gmail.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/staging/greybus/light.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/staging/greybus/light.c b/drivers/staging/greybus/light.c index 9999f84016992..eb69500e080e0 100644 --- a/drivers/staging/greybus/light.c +++ b/drivers/staging/greybus/light.c @@ -1029,14 +1029,18 @@ static int gb_lights_light_config(struct gb_lights *glights, u8 id) if (!strlen(conf.name)) return -EINVAL; - light->channels_count = conf.channel_count; light->name = kstrndup(conf.name, NAMES_MAX, GFP_KERNEL); if (!light->name) return -ENOMEM; - light->channels = kcalloc(light->channels_count, + light->channels = kcalloc(conf.channel_count, sizeof(struct gb_channel), GFP_KERNEL); if (!light->channels) return -ENOMEM; + /* + * Publish channels_count only after channels allocation so cleanup + * doesn't walk a NULL channels pointer on allocation failure. + */ + light->channels_count = conf.channel_count; /* First we collect all the configurations for all channels */ for (i = 0; i < light->channels_count; i++) { -- 2.51.0