From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pj2-f12.google.com (mail-pj2-f12.google.com [74.125.227.140]) (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 7C13B495039 for ; Thu, 10 Sep 2026 20:06:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.227.140 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789070801; cv=none; b=Y8GkcTeIgUv7ga4vWcfolcw39ZjWhgdN54bDTSdirGHQefFQAucovef/FABx4g8qF4bAswWz8V/MD778wteOK1BqaGD4vP3FoffGC/8nAN4sOfIbmaURwPYVfUm5eTu6zzI38H6SUKv3/smGYUrKjKBReksnGCSGelYGkmKZhw0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789070801; c=relaxed/simple; bh=bIekzr/acASAo8pLqBfoGXi82QPpe9AW/HLpSxdjKu0=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=WgwBjZGTkxLgU8pyfQCOf+4p4MUXGZrXwZVIGKssQIGqECH15cEMkRidMS3bJhk41WbWAvPOrnWtZLKtWT2atBHC9RE5zmdUz7JX5u4pPuAWoxWsSJfKBFlZYuNFJEZnoivLcrWKZdlVcHFWvRh2Ums5qmzDsvviEbNekcx9SmU= 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=jbDeXDsX; arc=none smtp.client-ip=74.125.227.140 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="jbDeXDsX" Received: by mail-pj2-f12.google.com with SMTP id 98e67ed59e1d1-396ccc02279so140537a91.1 for ; Thu, 10 Sep 2026 13:06:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1789070800; x=1789675600; 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:content-type; bh=Pw223cD4yf9W0em0F6VzM2Cty/ImT+5nXI2srqsFOi0=; b=jbDeXDsXw+Uec4UjxAbQuevSOKPNPz4x7bO5lVnNfsIGFwY3YxcfgSjwVMp5AnJbkI NBJONACzfzHiwJvhBFU+Jyl1icap1sUMdk/cbMu6mx5MCEWMT904IYIP3O3IPaHrUo7e feEjQfrTx4bCYc0IvoLiylNYl5BiOU29VPt+LFlXTTz4r9BO3o5FjS9k3XkbVLkoGCSV kLCM9QD6dPn45UsC+uEHaW/xyKCsZhVN4kw5eT+DbEyuCJ72JEPTDbWgpv25gMWBEMJk 7zHjKIMudYcHbBUcjzz0+io9kc/S+G5tA6kZeZj4sjSybDqbEXOxXrVd4FXNWJdXie0F ejmg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1789070800; x=1789675600; 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:content-type; bh=Pw223cD4yf9W0em0F6VzM2Cty/ImT+5nXI2srqsFOi0=; b=ibK0VY/cS502k8pkNNjj56uoV+iEbTzhjiYKwXsIQWsK/omzYE4MPQaWPs+y9NtV6u BWsIAl02LyUU0/UWUv0l+/PfECO0ZvVnu1jaEy9CnNzD4cfMQ3+Fboa87vITtiAs2yIj VWk5jzpVgIbOTifDc5rnKEV62DM+cU9ujXPnSLu0ES9lY4IGyhA01gAgBOlgNyH8i861 SN9jiBG4214SEUX4UGB4Kd1rIw+4Suk65yA+dj9ZOcfKNGTWMhNSVcRNdOj6iBlpI2c8 gTijhSBc1MBhLnz05qlwpmjoOh9fv5dXWKz5Gha4kaP/wHdklSHdqXEvcl+f/gq37w0O 7/Mg== X-Forwarded-Encrypted: i=1; AKwUvBwBVsMuSrecnJIfqf09eSj+mv2JvhGc6V1UWExsuz/HGnLXaObPZinU8qjtNBqpQ1wfuoQGW9oWP5EAsEY=@vger.kernel.org X-Gm-Message-State: AFuF++kFxDVVhOEy9MFd1lkdiLeDqrU65crlf+BD5DnM22oMDb4No6iV aiRltYi+Sra6+p1ACdbo4kghQBWjjENJHcg3i63A2D0vlB86aSP4jgSG X-Gm-Gg: AYBFou2Vj7PGQPifkLcSFGO72qBNRVRyBMszhyIILQgHG7Rtjmib3TrXOTnpfhWEuhm tJgpnGXNAgOWmuQW3Ti2rjDCuqU8KUtIfxLl5WamjVKS4HLpC1E/fZeSGYVHswqsUAfcA66T/lm ma4qB40bgvbzyVw6sE/h2VUNnjbvGcc1n7i71R2tO31K5vvXWtpL+ESwEy96MNLb2UsaCgwoXPv USnj6ClOZnRPioHlTsu8pH59HSkY7FiyX4PQuS4o+kE/Dw+rKWVPl9Sm3IZDOuepA8vOzp0GDwb SoqiKM7OBe0M2Dww7aPsZnT87eMEwcMtEDvXlpDTVI03jz/gfftH0wm7RgZO7CHcAgYirPdzzFQ sY7EM2AVq8B0SQKjSEknSUhRrOvxqsk62oFR2LL5U+5sHPrtst6uquoxXLdjLTxEdBADzKJwuNB /hmeHO0NkZn+bdJCsWz1T7T23K0Jl3a/TvXmeKFWw8j3T5l0udssiTuYMByWLImF6Lulu23/Tbl 5FK7gAuRUFOiNOH9aDDsRVIHlCJwRMLmWDlJJABtxy2aZnqeJSOb1qEd5/PhOCzD6GbWzWTagHM DB2iVkd1+HUzVLKsDEV43oVO+KPdC24XiExC7iAmtd29gPH23w== X-Received: by 2002:a17:90b:3dcd:b0:399:ea1:5a82 with SMTP id 98e67ed59e1d1-39d9bc66ab9mr689655a91.3.1789070799543; Thu, 10 Sep 2026 13:06:39 -0700 (PDT) Received: from ryzen.lan ([2601:644:8000:7a86::e35]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-39d994cc978sm690227a91.9.2026.09.10.13.06.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 10 Sep 2026 13:06:39 -0700 (PDT) From: Rosen Penev To: dmaengine@vger.kernel.org Cc: Vinod Koul , Frank Li , Xuelin Shi , Harninder Rai , linux-kernel@vger.kernel.org (open list) Subject: [PATCHv4] dmaengine: fsl_raid: check fsl_re_chan_probe() return value Date: Thu, 10 Sep 2026 13:06:37 -0700 Message-ID: <20260910200637.41512-1-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 fsl_re_probe() ignores the return value of fsl_re_chan_probe() and unconditionally increments total_chans. When a channel fails to probe (for example, an IRQ mapping failure) its re_jrs[] slot is left NULL, yet total_chans still advances, so fsl_re_remove_chan() later dereferences the NULL pointer during device removal. Check return value and only count successfully probed channels, and guard fsl_re_remove() against NULL entries. Fixes: ad80da658bbc ("dmaengine: Driver support for FSL RaidEngine device.") Assisted-by: opencode:hy3-free Signed-off-by: Rosen Penev --- v4: use break; v3: fix sashiko review v2: fix description drivers/dma/fsl_raid.c | 27 +++++++++++++++++++++------ 1 file changed, 21 insertions(+), 6 deletions(-) diff --git a/drivers/dma/fsl_raid.c b/drivers/dma/fsl_raid.c index 9cc289f7129e..6167fa652e96 100644 --- a/drivers/dma/fsl_raid.c +++ b/drivers/dma/fsl_raid.c @@ -836,18 +836,32 @@ static int fsl_re_probe(struct platform_device *ofdev) } /* Find out the Job Rings present under each JQ */ for_each_child_of_node(np, child) { + if (ridx >= FSL_RE_MAX_CHANS) { + dev_warn(dev, + "too many job rings, max %d\n", + FSL_RE_MAX_CHANS); + of_node_put(child); + break; + } + rc = of_device_is_compatible(child, "fsl,raideng-v1.0-job-ring"); + if (!rc) + continue; + + rc = fsl_re_chan_probe(ofdev, child, ridx, off); if (rc) { - fsl_re_chan_probe(ofdev, child, ridx++, off); - re_priv->total_chans++; + dev_err(dev, + "job ring %d probe failed: %d\n", + ridx, rc); + continue; } + ridx++; + re_priv->total_chans++; } } - dma_async_device_register(dma_dev); - - return 0; + return dma_async_device_register(dma_dev); } static void fsl_re_remove_chan(struct fsl_re_chan *chan) @@ -872,7 +886,8 @@ static void fsl_re_remove(struct platform_device *ofdev) /* Cleanup chan related memory areas */ for (i = 0; i < re_priv->total_chans; i++) - fsl_re_remove_chan(re_priv->re_jrs[i]); + if (re_priv->re_jrs[i]) + fsl_re_remove_chan(re_priv->re_jrs[i]); /* Unregister the driver */ dma_async_device_unregister(&re_priv->dma_dev); -- 2.55.0