From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pf1-f181.google.com (mail-pf1-f181.google.com [209.85.210.181]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 61AEB33F59E for ; Sat, 4 Jul 2026 23:47:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.181 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783208859; cv=none; b=un6NQd6XLq1FenoOOe+rObUthgXPeIeD3vcOU58fLZSruozUzBUwjKr4kaEKUAW4ehjPngrV4b1ZMrHwcgGqhgkCAS71+E3+hBVERG2VM/2KD7lnCBVOxA5ocDSpl1ifqSIFG/oLgBgZdQtvHproQ+DT4P02rRB8m80tDVbVS6o= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783208859; c=relaxed/simple; bh=XRhIVVXGg+e7/ghtao2LStSD4aCHgtklHbpMTVfJ10E=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=ocj9IjuOuHxnbXH2C0TlI3CmynDJ5zalgQ50brVNTz8mVJOuYELsc+XISNa+rh+hWMlwijlQEAkwDnOr+m3Qw0q8V2VioZuK24GbN/3prJUiw0844aOrP2iYPqYmdXKWvHGzViVRUt4PKfUDsi1PJD6HYABE0QznMcNtIm7RYdw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=KLiZf2kF; arc=none smtp.client-ip=209.85.210.181 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="KLiZf2kF" Received: by mail-pf1-f181.google.com with SMTP id d2e1a72fcca58-847a483e344so1377438b3a.0 for ; Sat, 04 Jul 2026 16:47:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1783208857; x=1783813657; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=LAV38zDEB+lLR8E4aIVKK3GslMa+YpWK0KGFz69oGdE=; b=KLiZf2kFRfJl9XHzTEX4x62bzRXhO1klmCvPxzk06fbIfZO8yRH6cPCGeldzsP86Li q0xwpU4PN8SYB+42cwfdI293HfyNXzfSDs9pDWxdho0kYVA+TfrCgTl9KWBcnUppyWwY JY8mxCm5Th/krzt/MNGT8PeSFxDsgcZFMSzQ2ZiG0uSDTmB2kh1ahTI49b/y3D4nXuF5 47UI3GF1hSheMqozPo8D+AZCfGb16tzf3mHU+H/t61YrxYKgDlDCUwZWra4NXPKCLpq2 jcKMDkEa1XKNuJCJ9kimDmYvH0WN5igrZSYIqp7f/SKcWes7VEFZ73WpbZ0IwlTiPCBs Zorw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1783208857; x=1783813657; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=LAV38zDEB+lLR8E4aIVKK3GslMa+YpWK0KGFz69oGdE=; b=Fsw3s7qw7NL7xJWu6TqHrrIhPpE/ktBQJfIGkA2fy76pLJShozknpqVt4+v3hTHSQ3 7H4GvB/qCCryfvIahrI40pjBmwf/wN2ktj4sLfcCksljLi9o3LHkdTG6hVZV7SvOtx6k X2oe2scE3sdU4sfhFsrxkqG6nKBCsfwwgCnR98Kb8N28xZa3vD2OhKLdztcfC37ITARX +IldHSkD8VkBxy+7jGb0hRkyJe0N9vOJ/mgc3ifB5lOuqmzC5d8w+21qpldDUrAWtQDL yVgVygr5k3Y2JPC/9S5yWjbe4O5x5darPHSBaLpOCBSghuNQe5gNeJixoHN9KZcQT3Oz Ao9A== X-Forwarded-Encrypted: i=1; AFNElJ/UMpKveauXkVmUGQ4NPD5/ZZHuc6heWEzwOThH4akqBi+YBSmSazCpBo5bb703X0MjfD8hreJaTR1wxK8=@vger.kernel.org X-Gm-Message-State: AOJu0YzSWebC5V8rSa48hjcDXV7qhByf7fqc0cVIZcmYm8EPMTvchXQr k8G6qAWira/ZyfGf9wU2YnKUrcz4/Tiy+EubOEkdi/U+D7A5N4YgfR5U X-Gm-Gg: AfdE7clR2z22TXJ+X06mvLIX/xW/kND0a+Wt2A4OtO2W3hb4ajiCIPQI6MQrfZW0Syz +y1IrScrHe36Z3GYhcs2uqAYe8Fb3DZkZCF8Jg0rr6WxfP0bAwuUw8M2VDLH5Go3g7ZuCzmf64u dmFPXZePYCNTdgIEwcurwEQWqxa54+iPbmHr+RQ8w0ffHiKO5iP2v+0bnaSV6jhn/sJY9oB0Ip1 qguAhaGoT/yI034UfhTA1UGdkaL3+oD/WWlvv5D1wnJ3J2WUSxQy+pi7YrTyUfOFehq81+SdZWe ysfX9rpWiqfSplJmppbLaOpzYfmFli5StYrw0oHeTezNeX2N3xvuV2RXUV1lEPQHg3M0mahaHlP EmD2kwOHKa/KDIiBkcJZMHHGjdSUf//hfiytb/ev0RSoarHcUYiSxTuq6JGCL4fYnxG9KM26h/c C3moZFGw94+3xu0MG/qNTNwpADXw7Ki4VXN1QvZDBebBuQHe/j+I7wMTmUk1itT0x7B44RZPvXX fTPSBEw/Q== X-Received: by 2002:a05:6a00:1743:b0:847:7cf2:a8ff with SMTP id d2e1a72fcca58-847e190526dmr8079170b3a.30.1783208857480; Sat, 04 Jul 2026 16:47:37 -0700 (PDT) Received: from ryzen.lan ([2601:644:8000:7a86::e34]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-847f6d82382sm1609264b3a.49.2026.07.04.16.47.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 04 Jul 2026 16:47:36 -0700 (PDT) From: Rosen Penev To: netdev@vger.kernel.org Cc: Claudiu Manoil , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , linux-kernel@vger.kernel.org (open list) Subject: [PATCH] net: gianfar: fix use-after-free in gfar_enet_open on startup_gfar failure Date: Sat, 4 Jul 2026 16:47:34 -0700 Message-ID: <20260704234734.1779991-1-rosenp@gmail.com> X-Mailer: git-send-email 2.55.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit If startup_gfar() fails in gfar_enet_open(), the PHY remains connected and IRQs remain requested. Since ndo_open returned an error, IFF_UP is not set and ndo_stop (gfar_close) will not be called on unregister, leaving the IRQ handlers registered against freed net_device memory when the driver is removed. Add proper error unwinding: phy_disconnect() and gfar_free_irq() before returning the error. Fixes: 80ec396cb6b5 ("gianfar: Don't free/request irqs on device reset") Assisted-by: Opencode:Big-Pickle Signed-off-by: Rosen Penev --- drivers/net/ethernet/freescale/gianfar.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/freescale/gianfar.c b/drivers/net/ethernet/freescale/gianfar.c index 89215e1ddc2d..4b3a5eaadfb5 100644 --- a/drivers/net/ethernet/freescale/gianfar.c +++ b/drivers/net/ethernet/freescale/gianfar.c @@ -2878,8 +2878,11 @@ static int gfar_enet_open(struct net_device *dev) return err; err = startup_gfar(dev); - if (err) + if (err) { + phy_disconnect(dev->phydev); + gfar_free_irq(priv); return err; + } return err; } -- 2.55.0