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 081541ADC83; Mon, 4 May 2026 14:10:25 +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=1777903825; cv=none; b=QT75Gq2hTBnzr4R1qvIXz4dEDZ7/rvzP6CRSoauETIvPT5/8XJSv4xfvZWR7WsM/lfoF0RneJLIgwdTJMPWsmFYiaKhO9izkZotRIzV83VCT5gT15CePxIQXTX2Ds7fRmR6ztbtsB4F7Jup6WNA9u/aom6S93h041QSTxXXDCwY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777903825; c=relaxed/simple; bh=KpcqcBzSp+/l3c7hrPOCdXcCTxHnx3jF/LfkpO9TZco=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=abpDXuzA46mgbGBpoj93ioMSRj5dXd1tZ2FnL9akshl7r9mrJ4Sk11K5s7WVBnvassuKQ5jKdi4Q9vVM0hTL5sxhheaaRIm3G+dYAFnC2886vwocxZsk/04apCKhnoKkGHTNtkY6iqItDptCjxtVRmqRJk6AL8yeSY27Xj33RQk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=1RhUxtdY; 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="1RhUxtdY" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8FD0CC2BCB8; Mon, 4 May 2026 14:10:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1777903824; bh=KpcqcBzSp+/l3c7hrPOCdXcCTxHnx3jF/LfkpO9TZco=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=1RhUxtdYMU7BaeP5C3B4Q1eXfxYlx9Z0gxByicqlKdmc/DempcLzTkGoReRZjO03i Gr28lwwGiAZHdjoARRnnN+vI/lTSWTgNdJnhY1jXrhMCFLTH7uAeHwK2UJBlQH4XJI iEnEvsZ9rXAPXuCR/2MAGV4pnZTVEt72dhECljJ0= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, James Kim , Miquel Raynal Subject: [PATCH 6.18 076/275] mtd: docg3: fix use-after-free in docg3_release() Date: Mon, 4 May 2026 15:50:16 +0200 Message-ID: <20260504135145.749981577@linuxfoundation.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260504135142.929052779@linuxfoundation.org> References: <20260504135142.929052779@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: James Kim commit ca19808bc6fac7e29420d8508df569b346b3e339 upstream. 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 Signed-off-by: Greg Kroah-Hartman --- drivers/mtd/devices/docg3.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) --- a/drivers/mtd/devices/docg3.c +++ b/drivers/mtd/devices/docg3.c @@ -2049,7 +2049,6 @@ err_probe: 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 platfor if (cascade->floors[floor]) doc_release_device(cascade->floors[floor]); - bch_free(docg3->cascade->bch); + bch_free(cascade->bch); } #ifdef CONFIG_OF