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 EAAAA1863 for ; Wed, 28 Dec 2022 15:49:17 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 59179C433D2; Wed, 28 Dec 2022 15:49:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1672242557; bh=vejQkFDdSOS03xjmkABwON08TrvkSVRcuB0GKoJf21k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=a+ubaS5kn5RTjRKYy8mDBYjU1Inr5FuqnaHfbM/u4A6qiyL1FP38nSIIv0p9eERTV 24U7rIzAKCss6QbCByZVWf56T+aod5ylY2a6DbRvexUJhrhi0Ggm7xTK5doAH12F4q Wx3JwK0M+Kv+8djxnZZNzNTnltKsHYOqyXDyk514= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Xia Fukun , Jani Nikula , Rodrigo Vivi , Sasha Levin Subject: [PATCH 6.0 0425/1073] drm/i915/bios: fix a memory leak in generate_lfp_data_ptrs Date: Wed, 28 Dec 2022 15:33:33 +0100 Message-Id: <20221228144339.566314747@linuxfoundation.org> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20221228144328.162723588@linuxfoundation.org> References: <20221228144328.162723588@linuxfoundation.org> User-Agent: quilt/0.67 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 From: Xia Fukun [ Upstream commit 1382901f75a5a7dc8eac05059fd0c7816def4eae ] When (size != 0 || ptrs->lvds_ entries != 3), the program tries to free() the ptrs. However, the ptrs is not created by calling kzmalloc(), but is obtained by pointer offset operation. This may lead to memory leaks or undefined behavior. Fix this by replacing the arguments of kfree() with ptrs_block. Fixes: a87d0a847607 ("drm/i915/bios: Generate LFP data table pointers if the VBT lacks them") Signed-off-by: Xia Fukun Signed-off-by: Jani Nikula Link: https://patchwork.freedesktop.org/patch/msgid/20221125063428.69486-1-xiafukun@huawei.com (cherry picked from commit 7674cd0b7d28b952151c3df26bbfa7e07eb2b4ec) Signed-off-by: Rodrigo Vivi Signed-off-by: Sasha Levin --- drivers/gpu/drm/i915/display/intel_bios.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/display/intel_bios.c b/drivers/gpu/drm/i915/display/intel_bios.c index 459571e2cc57..2bfcfbfa52a4 100644 --- a/drivers/gpu/drm/i915/display/intel_bios.c +++ b/drivers/gpu/drm/i915/display/intel_bios.c @@ -414,7 +414,7 @@ static void *generate_lfp_data_ptrs(struct drm_i915_private *i915, ptrs->lvds_entries++; if (size != 0 || ptrs->lvds_entries != 3) { - kfree(ptrs); + kfree(ptrs_block); return NULL; } -- 2.35.1