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GET /api/1.2/patches/2222656/?format=api
{ "id": 2222656, "url": "http://patchwork.ozlabs.org/api/1.2/patches/2222656/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-tegra/patch/20260413101453.495549-1-hossu.alexandru@gmail.com/", "project": { "id": 21, "url": "http://patchwork.ozlabs.org/api/1.2/projects/21/?format=api", "name": "Linux Tegra Development", "link_name": "linux-tegra", "list_id": "linux-tegra.vger.kernel.org", "list_email": "linux-tegra@vger.kernel.org", "web_url": null, "scm_url": null, "webscm_url": null, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260413101453.495549-1-hossu.alexandru@gmail.com>", "list_archive_url": null, "date": "2026-04-13T10:14:53", "name": "[v2,1/3] staging: nvec: fix use-after-free in nvec_rx_completed()", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "fe00dd2fcc1696ff4f43d233bb5bf69cae32a32b", "submitter": { "id": 92777, "url": "http://patchwork.ozlabs.org/api/1.2/people/92777/?format=api", "name": "Alexandru Hossu", "email": "hossu.alexandru@gmail.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-tegra/patch/20260413101453.495549-1-hossu.alexandru@gmail.com/mbox/", "series": [ { "id": 499677, "url": "http://patchwork.ozlabs.org/api/1.2/series/499677/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-tegra/list/?series=499677", "date": "2026-04-13T10:14:53", "name": "[v2,1/3] staging: nvec: fix use-after-free in nvec_rx_completed()", "version": 2, "mbox": "http://patchwork.ozlabs.org/series/499677/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2222656/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2222656/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linux-tegra+bounces-13743-incoming=patchwork.ozlabs.org@vger.kernel.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linux-tegra@vger.kernel.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=R7jO8Tld;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c0a:e001:db::12fc:5321; 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Immediately after this, the code\naccesses nvec->rx->data[0] to check the message type.\n\nSince nvec_msg_free() marks the pool slot as available via atomic_set(),\nany concurrent or subsequent call to nvec_msg_alloc() could claim that\nsame slot and overwrite its data[] array. Reading nvec->rx->data[0] after\nfreeing the message is therefore a use-after-free.\n\nFix this by saving the message type byte before calling nvec_msg_free(),\nthen using the saved value for the battery quirk check.\n\nFixes: d6bdcf2e1019 (\"staging: nvec: Add battery quirk to ignore incomplete responses\")\nSigned-off-by: Alexandru Hossu <hossu.alexandru@gmail.com>\n---\nv2:\n - Add Fixes tag (Dan Carpenter)\n - Remove obvious comment (Dan Carpenter)\n - Move declaration to start of block (Dan Carpenter)\n\n drivers/staging/nvec/nvec.c | 4 +++-\n 1 file changed, 3 insertions(+), 1 deletion(-)", "diff": "diff --git a/drivers/staging/nvec/nvec.c b/drivers/staging/nvec/nvec.c\nindex 952c5a849a56..2a3499dd4d63 100644\n--- a/drivers/staging/nvec/nvec.c\n+++ b/drivers/staging/nvec/nvec.c\n@@ -494,6 +494,8 @@ static void nvec_tx_completed(struct nvec_chip *nvec)\n static void nvec_rx_completed(struct nvec_chip *nvec)\n {\n \tif (nvec->rx->pos != nvec_msg_size(nvec->rx)) {\n+\t\tunsigned char msg_type = nvec->rx->data[0];\n+\n \t\tdev_err(nvec->dev, \"RX incomplete: Expected %u bytes, got %u\\n\",\n \t\t\t(uint)nvec_msg_size(nvec->rx),\n \t\t\t(uint)nvec->rx->pos);\n@@ -502,7 +504,7 @@ static void nvec_rx_completed(struct nvec_chip *nvec)\n \t\tnvec->state = 0;\n \n \t\t/* Battery quirk - Often incomplete, and likes to crash */\n-\t\tif (nvec->rx->data[0] == NVEC_BAT)\n+\t\tif (msg_type == NVEC_BAT)\n \t\t\tcomplete(&nvec->ec_transfer);\n \n \t\treturn;\n", "prefixes": [ "v2", "1/3" ] }