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 B253F39B482 for ; Fri, 1 May 2026 11:02:10 +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=1777633330; cv=none; b=iC/jyEZRfWBDr+ojQ4hm1JRJtffbJT6gBNlnHH0dV3fLl9ZOgpOJyHVeyDsJGiAodMnJDD97JJudRw26tqPXK1ITG16j72cv/ev5RMke9+Bv2N0E07KouZaZGnM70tRvxqXIE+bAsXeTaP4JkOnh32XMBA9tiplNhsoNvQKHBMg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777633330; c=relaxed/simple; bh=jFAwZO1U/CylFdywkYb4u2xzoatn+00v5fuPsqOQt/0=; h=Subject:To:Cc:From:Date:Message-ID:MIME-Version:Content-Type; b=tJsd+EOwgC2b1NnEHyNqkRaMVIddg0x1mDhp8ID03hF1Ps/nmTeckTEw2G6GPot7RlVCJ76AWJUVL7Eipo7+JMlf+tNEqs+wAjrYegOJeP6e5ceBqsjAAnXx8up6Fj94L2lr/j5nXnXJ2fwON/i1TIG5un7o139FSDoHlIC1a+Q= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=WfOamEvc; 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="WfOamEvc" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3D399C2BCB4; Fri, 1 May 2026 11:02:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1777633330; bh=jFAwZO1U/CylFdywkYb4u2xzoatn+00v5fuPsqOQt/0=; h=Subject:To:Cc:From:Date:From; b=WfOamEvcxRSlv31bs+kpwesCpgPHGP3/2r3UkoBd9Fcmfx4SUxVdxt1X7Oy9DAWn2 98DBGq3SF/nR04AP2oVyoP6EqBLQg8AHm6IkvsM1i2QZzFwbhVfEzo71AiHcUbp9Re +GKYqUj4cqaVdSMpwNNbpJ+rtbRaXpbMlg/Q44uw= Subject: FAILED: patch "[PATCH] mtd: docg3: fix use-after-free in docg3_release()" failed to apply to 6.6-stable tree To: james010kim@gmail.com,miquel.raynal@bootlin.com Cc: From: Date: Fri, 01 May 2026 13:02:08 +0200 Message-ID: <2026050108-ozone-wiry-64b4@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 6.6-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-6.6.y git checkout FETCH_HEAD git cherry-pick -x ca19808bc6fac7e29420d8508df569b346b3e339 # git commit -s git send-email --to '' --in-reply-to '2026050108-ozone-wiry-64b4@gregkh' --subject-prefix 'PATCH 6.6.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