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 5346239D6CE for ; Fri, 1 May 2026 11:02:24 +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=1777633344; cv=none; b=AK6Eudt2SUpGsC/87pfRPy2xNs7JE4KQOhkalHVtm46TX21woSjswx2TmdeY3mVCIK0aB84w/vNt/NQo5xP4G7lkAIZZ+0JB8S9n2i9HbCY6Tdt/q8uDz7/diiHhzZkCCSlTExUfpaeC+1HPSE/KTlKO2rBzw8lIxkwZGCWBW9s= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777633344; c=relaxed/simple; bh=2H7exRh7OVlr9I96THwfzkUrR2OP1ssxb1M9SHDFcOY=; h=Subject:To:Cc:From:Date:Message-ID:MIME-Version:Content-Type; b=QGBcQ7XF1HjP2/QOpmCfPkpVRtL64eqbHMDUMuA+jikL6EeFxFPDkdHmNIx0NIdePF4K8BNVtR5G7ISrWboFDlO93JcokCLFtUWCQiUep8HLhBG77GHIikGy7DHFVXiIiqBw0JZ2X8lOjwIftZMMBOHc3SFwNUSgPuZxYUsHIvw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=XntSgZGW; 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="XntSgZGW" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9531EC2BCB7; Fri, 1 May 2026 11:02:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1777633343; bh=2H7exRh7OVlr9I96THwfzkUrR2OP1ssxb1M9SHDFcOY=; h=Subject:To:Cc:From:Date:From; b=XntSgZGWO7xhqnivHYWXU1sewCaGZ3bSPIrTeyKMlibdJEsQ0zKVCd5U9CMiGxJI2 tgt2m/fEvk23vY7fOYfKZRCXzkEal01DW6D347068gbpM8KCHFEfBUNg2pZg5t7mAD uafpDsMVfsJC+SDFM9NbunKJXkl0JK8c7fypmABM= Subject: FAILED: patch "[PATCH] mtd: docg3: fix use-after-free in docg3_release()" failed to apply to 5.15-stable tree To: james010kim@gmail.com,miquel.raynal@bootlin.com Cc: From: Date: Fri, 01 May 2026 13:02:09 +0200 Message-ID: <2026050109-regular-masculine-854d@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y git checkout FETCH_HEAD git cherry-pick -x ca19808bc6fac7e29420d8508df569b346b3e339 # git commit -s git send-email --to '' --in-reply-to '2026050109-regular-masculine-854d@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^.. Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From ca19808bc6fac7e29420d8508df569b346b3e339 Mon Sep 17 00:00:00 2001 From: James Kim Date: Mon, 9 Mar 2026 15:05:12 +0900 Subject: [PATCH] mtd: docg3: fix use-after-free in docg3_release() In docg3_release(), the docg3 pointer is obtained from cascade->floors[0]->priv before the loop that calls doc_release_device() on each floor. doc_release_device() frees the docg3 struct via kfree(docg3) at line 1881. After the loop, docg3->cascade->bch dereferences the already-freed pointer. Fix this by accessing cascade->bch directly, which is equivalent since docg3->cascade points back to the same cascade struct, and is already available as a local variable. This also removes the now-unused docg3 local variable. Fixes: c8ae3f744ddc ("lib/bch: Rework a little bit the exported function names") Cc: stable@vger.kernel.org Signed-off-by: James Kim Signed-off-by: Miquel Raynal diff --git a/drivers/mtd/devices/docg3.c b/drivers/mtd/devices/docg3.c index 33050a2a80f7..603fd0efc2ea 100644 --- a/drivers/mtd/devices/docg3.c +++ b/drivers/mtd/devices/docg3.c @@ -2049,7 +2049,6 @@ static int __init docg3_probe(struct platform_device *pdev) static void docg3_release(struct platform_device *pdev) { struct docg3_cascade *cascade = platform_get_drvdata(pdev); - struct docg3 *docg3 = cascade->floors[0]->priv; int floor; doc_unregister_sysfs(pdev, cascade); @@ -2057,7 +2056,7 @@ static void docg3_release(struct platform_device *pdev) if (cascade->floors[floor]) doc_release_device(cascade->floors[floor]); - bch_free(docg3->cascade->bch); + bch_free(cascade->bch); } #ifdef CONFIG_OF