[{"id":3675218,"web_url":"http://patchwork.ozlabs.org/comment/3675218/","msgid":"<87mrzco41v.fsf@prevas.dk>","list_archive_url":null,"date":"2026-04-09T09:50:52","subject":"Re: [PATCH v1 1/2] lib: hashtable: fix integer overflow in himport_r","submitter":{"id":89443,"url":"http://patchwork.ozlabs.org/api/people/89443/","name":"Rasmus Villemoes","email":"ravi@prevas.dk"},"content":"On Wed, Apr 08 2026, Aristo Chen wrote:\n\n> When size == SIZE_MAX, the expression malloc(size + 1) wraps to\n> malloc(0) due to unsigned integer overflow. malloc(0) may return a\n> non-NULL pointer, causing the subsequent memcpy(data, env, size) to\n> write SIZE_MAX bytes into a zero-byte allocation.\n>\n> This is reachable from the U-Boot console via \"env import\", where size\n> is taken directly from a user-supplied hex argument.\n>\n> Add an explicit check for SIZE_MAX before the malloc call and return\n> EINVAL.\n>\n> Signed-off-by: Aristo Chen \n> ---\n> lib/hashtable.c | 7 +++++++\n> 1 file changed, 7 insertions(+)\n>\n> diff --git a/lib/hashtable.c b/lib/hashtable.c\n> index 75c263b5053..902fa6f3e98 100644\n> --- a/lib/hashtable.c\n> +++ b/lib/hashtable.c\n> @@ -820,6 +820,13 @@ int himport_r(struct hsearch_data *htab,\n> \t\treturn 0;\n> \t}\n> \n> +\t/* Check for potential integer overflow */\n> +\tif (size == SIZE_MAX) {\n> +\t\tdebug(\"%s: size too large, would overflow\\n\", __func__);\n> +\t\t__set_errno(EINVAL);\n> +\t\treturn 0;\n> +\t}\n> +\n\nWell, you can corrupt arbitrary memory from the u-boot shell, so \"taken\ndirectly from a user-supplied hex argument\" is not really a very\ncompelling argument in the context of U-Boot.\n\nInstead of adding such ad hoc checks that mostly just increase code size\na little, I think it's better to zoom out and see what this really\ndoes. And this is ripe for adding a memdup_nul() helper (linux has that\nunder the name kmemdup_nul). If we add that, we can do the overflow\ncheck inside that in that one place, and we can convert a lot of similar\nusers all over the tree, and eliminate quite a lot of #loc.\n\nI'll try to write something.\n\nRasmus","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=prevas.dk header.i=@prevas.dk header.a=rsa-sha256\n header.s=selector1 header.b=GW9YEvX3;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.denx.de\n (client-ip=85.214.62.61; helo=phobos.denx.de;\n envelope-from=u-boot-bounces@lists.denx.de; receiver=patchwork.ozlabs.org)","phobos.denx.de;\n dmarc=pass (p=reject dis=none) header.from=prevas.dk","phobos.denx.de;\n spf=pass smtp.mailfrom=u-boot-bounces@lists.denx.de","phobos.denx.de;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=prevas.dk header.i=@prevas.dk header.b=\"GW9YEvX3\";\n\tdkim-atps=neutral","phobos.denx.de;\n dmarc=pass (p=reject dis=none) header.from=prevas.dk","phobos.denx.de;\n spf=pass smtp.mailfrom=rasmus.villemoes@prevas.dk","dkim=none (message not signed)\n header.d=none;dmarc=none action=none header.from=prevas.dk;"],"Received":["from phobos.denx.de (phobos.denx.de [85.214.62.61])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4frwDQ6TGHz1yCv\n\tfor ; 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Wed, 8 Apr 2026 19:48:15 +0200 (CEST)","from list by ciao.gmane.io with local (Exim 4.92)\n (envelope-from )\n id 1wAX0e-0003xQ-2n\n for u-boot@lists.denx.de; Wed, 08 Apr 2026 19:48:12 +0200"],"X-Spam-Checker-Version":"SpamAssassin 3.4.2 (2018-09-13) on phobos.denx.de","X-Spam-Level":"","X-Spam-Status":"No, score=-1.6 required=5.0 tests=BAYES_00,\n HEADER_FROM_DIFFERENT_DOMAINS,RCVD_IN_DNSWL_BLOCKED,\n RCVD_IN_VALIDITY_CERTIFIED_BLOCKED,RCVD_IN_VALIDITY_RPBL_BLOCKED,\n SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.2","X-Injected-Via-Gmane":"http://gmane.org/","To":"u-boot@lists.denx.de","From":"Stefan Monnier ","Subject":"Re: [PATCH v1 1/2] lib: hashtable: fix integer overflow in himport_r","Date":"Wed, 08 Apr 2026 13:47:59 -0400","Message-ID":"","References":"<20260408140339.798015-1-aristo.chen@canonical.com>","Mime-Version":"1.0","Content-Type":"text/plain","User-Agent":"Gnus/5.13 (Gnus v5.13)","Cancel-Lock":"sha1:nvPhJnCGivcZzT0rPesLvFb5prI=","X-Mailman-Approved-At":"Thu, 09 Apr 2026 15:00:51 +0200","X-BeenThere":"u-boot@lists.denx.de","X-Mailman-Version":"2.1.39","Precedence":"list","List-Id":"U-Boot discussion ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"u-boot-bounces@lists.denx.de","Sender":"\"U-Boot\" ","X-Virus-Scanned":"clamav-milter 0.103.8 at phobos.denx.de","X-Virus-Status":"Clean"}}]