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GET /api/patches/2217542/?format=api
{ "id": 2217542, "url": "http://patchwork.ozlabs.org/api/patches/2217542/?format=api", "web_url": "http://patchwork.ozlabs.org/project/sparclinux/patch/20260330062920.40786-1-pengpeng@iscas.ac.cn/", "project": { "id": 10, "url": "http://patchwork.ozlabs.org/api/projects/10/?format=api", "name": "Linux SPARC Development ", "link_name": "sparclinux", "list_id": "sparclinux.vger.kernel.org", "list_email": "sparclinux@vger.kernel.org", "web_url": null, "scm_url": null, "webscm_url": null, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260330062920.40786-1-pengpeng@iscas.ac.cn>", "list_archive_url": null, "date": "2026-03-30T06:29:20", "name": "[2/4] sparc: led: reject zero-length proc writes", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "a193b719e5d0d6f9918212b85219ee07dfe51ae4", "submitter": { "id": 93000, "url": "http://patchwork.ozlabs.org/api/people/93000/?format=api", "name": "Pengpeng Hou", "email": "pengpeng@iscas.ac.cn" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/sparclinux/patch/20260330062920.40786-1-pengpeng@iscas.ac.cn/mbox/", "series": [ { "id": 497962, "url": "http://patchwork.ozlabs.org/api/series/497962/?format=api", "web_url": "http://patchwork.ozlabs.org/project/sparclinux/list/?series=497962", "date": "2026-03-30T06:29:20", "name": null, "version": 1, "mbox": "http://patchwork.ozlabs.org/series/497962/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2217542/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2217542/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <SRS0=uqhz=B6=vger.kernel.org=sparclinux+bounces-6620-patchwork-incoming=ozlabs.org@ozlabs.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "sparclinux@vger.kernel.org" ], "Delivered-To": [ "patchwork-incoming@legolas.ozlabs.org", "patchwork-incoming@ozlabs.org" ], "Authentication-Results": [ "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=ozlabs.org\n (client-ip=2404:9400:2221:ea00::3; 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a=rsa-sha256; d=subspace.kernel.org;\n\ts=arc-20240116; t=1774852177; c=relaxed/simple;\n\tbh=RTry2/6w3o9ifRag6udpQB66EdMgoT4lfxjUgeE3yIg=;\n\th=From:To:Cc:Subject:Date:Message-ID:MIME-Version;\n b=vCrxnCP4c6TZtpr8g1vDvCLbFoTYrqqiRyuQAM1FCa1qsaEeiJu2E3/ZvcSWUc763ht2MC7An2He3GLAJVH8/vaBS0/wVJ0JQIuXZDnL44iJs2d0PxWynyscVMom6RjJHZ9sUmonVNlS3SS2r4B9QN/Wqya9+WjbxXFCsHtq3mI=" ], "ARC-Authentication-Results": [ "i=2; gandalf.ozlabs.org;\n dmarc=none (p=none dis=none) header.from=iscas.ac.cn;\n spf=pass (client-ip=172.105.105.114; helo=tor.lore.kernel.org;\n envelope-from=sparclinux+bounces-6620-patchwork-incoming=ozlabs.org@vger.kernel.org;\n receiver=ozlabs.org) smtp.mailfrom=vger.kernel.org", "i=1; smtp.subspace.kernel.org;\n dmarc=none (p=none dis=none) header.from=iscas.ac.cn;\n spf=pass smtp.mailfrom=iscas.ac.cn; arc=none smtp.client-ip=159.226.251.25" ], "From": "Pengpeng Hou <pengpeng@iscas.ac.cn>", "To": "davem@davemloft.net", "Cc": "andreas@gaisler.com,\n\tsparclinux@vger.kernel.org,\n\tlinux-kernel@vger.kernel.org,\n\tpengpeng@iscas.ac.cn", "Subject": "[PATCH 2/4] sparc: led: reject zero-length proc writes", "Date": "Mon, 30 Mar 2026 14:29:20 +0800", "Message-ID": "<20260330062920.40786-1-pengpeng@iscas.ac.cn>", "X-Mailer": "git-send-email 2.50.1", "Precedence": "bulk", "X-Mailing-List": "sparclinux@vger.kernel.org", "List-Id": "<sparclinux.vger.kernel.org>", "List-Subscribe": "<mailto:sparclinux+subscribe@vger.kernel.org>", "List-Unsubscribe": "<mailto:sparclinux+unsubscribe@vger.kernel.org>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-CM-TRANSID": "zQCowAC3Sw9AGMppK4TpCw--.28726S2", "X-Coremail-Antispam": "1UD129KBjvdXoWrtw4rZFWxJFyrGr15ury5CFg_yoWfWFb_Wa\n\t9rCa45GrsIgr47Xw1ak3yfZryay3W7JayFk3s2qrZ8JF95JrySq395J39Yyr4UXr4rGrs0\n\tkwn5Za4qyw1qkjkaLaAFLSUrUUUUjb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT\n\t9fnUUIcSsGvfJTRUUUbcAFF20E14v26r1j6r4UM7CY07I20VC2zVCF04k26cxKx2IYs7xG\n\t6rWj6s0DM7CIcVAFz4kK6r1j6r18M28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48ve4kI8w\n\tA2z4x0Y4vE2Ix0cI8IcVAFwI0_Xr0_Ar1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI0_Gr0_\n\tCr1l84ACjcxK6I8E87Iv67AKxVW0oVCq3wA2z4x0Y4vEx4A2jsIEc7CjxVAFwI0_GcCE3s\n\t1le2I262IYc4CY6c8Ij28IcVAaY2xG8wAqx4xG64xvF2IEw4CE5I8CrVC2j2WlYx0E2Ix0\n\tcI8IcVAFwI0_JrI_JrylYx0Ex4A2jsIE14v26r1j6r4UMcvjeVCFs4IE7xkEbVWUJVW8Jw\n\tACjcxG0xvY0x0EwIxGrwACjI8F5VA0II8E6IAqYI8I648v4I1lc7CjxVAaw2AFwI0_JF0_\n\tJw1l42xK82IYc2Ij64vIr41l4I8I3I0E4IkC6x0Yz7v_Jr0_Gr1lx2IqxVAqx4xG67AKxV\n\tWUJVWUGwC20s026x8GjcxK67AKxVWUGVWUWwC2zVAF1VAY17CE14v26r126r1DMIIYrxkI\n\t7VAKI48JMIIF0xvE2Ix0cI8IcVAFwI0_Jr0_JF4lIxAIcVC0I7IYx2IY6xkF7I0E14v26r\n\t4j6F4UMIIF0xvE42xK8VAvwI8IcIk0rVWUJVWUCwCI42IY6I8E87Iv67AKxVWUJVW8JwCI\n\t42IY6I8E87Iv6xkF7I0E14v26r4j6r4UJbIYCTnIWIevJa73UjIFyTuYvjfUYNVyDUUUU", "X-CM-SenderInfo": "pshqw1xhqjqxpvfd2hldfou0/", "X-Spam-Status": "No, score=-1.1 required=5.0 tests=ARC_SIGNED,ARC_VALID,\n\tDMARC_MISSING,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,\n\tSPF_HELO_NONE,SPF_PASS autolearn=disabled version=4.0.1", "X-Spam-Checker-Version": "SpamAssassin 4.0.1 (2024-03-25) on gandalf.ozlabs.org" }, "content": "led_proc_write() passes count straight through memdup_user_nul() and then\nunconditionally inspects buf[count - 1] to strip a trailing newline. A\nzero-length write therefore dereferences one byte before the allocated\nbuffer.\n\nReject empty writes before touching buf[count - 1].\n\nFixes: ee1858d3122d (\"[SPARC]: Add sun4m LED driver.\")\nSigned-off-by: Pengpeng Hou <pengpeng@iscas.ac.cn>\n---\n arch/sparc/kernel/led.c | 3 +++\n 1 file changed, 3 insertions(+)", "diff": "diff --git a/arch/sparc/kernel/led.c b/arch/sparc/kernel/led.c\nindex f4fb82b019bb..b9758fdbc054 100644\n--- a/arch/sparc/kernel/led.c\n+++ b/arch/sparc/kernel/led.c\n@@ -70,6 +70,9 @@ static ssize_t led_proc_write(struct file *file, const char __user *buffer,\n {\n \tchar *buf = NULL;\n \n+\tif (!count)\n+\t\treturn -EINVAL;\n+\n \tif (count > LED_MAX_LENGTH)\n \t\tcount = LED_MAX_LENGTH;\n \n", "prefixes": [ "2/4" ] }