From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from ale.deltatee.com (ale.deltatee.com [204.191.154.188]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7AB2C3A8739; Tue, 21 Jul 2026 16:10:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=204.191.154.188 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784650205; cv=none; b=b0GZvNSZ0WnH//yzHCt/POLbw1zCPW06pLrEGRIV352FJwOIv/6vg3U6SjkX6pIUvPYcaaHh6wUek73XDK6Fk4GitnvqHDaBV3BzmkAdMwErjK3MY/ePhFCmb12hAAOOUskV+lu8A/SbQZKfV4HGVHYooZNzBaNI8Vj+V8dXips= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784650205; c=relaxed/simple; bh=/bHx1KqUQ5FZegJF2+0lqfCDtUh0LCnmdvxhqwVny8s=; h=From:To:Cc:Date:Message-ID:In-Reply-To:References:MIME-Version: Subject; b=ZHT8WvzR/xjBdCjMdYm+GEi/dpD/UatNbn0h7Wptgi+rCZRP+/hMG8wvZGxk5lZmyL8vr51dC/yKzdK2cIREgpWOM5uTmctMdM1I8YSBC+0VwGIbSwad2JWsgW7dcrDC3d7xel8ZsBQxTPjop1WFnRaxAMcnMC8adRYTrUHccIA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=deltatee.com; spf=pass smtp.mailfrom=deltatee.com; dkim=pass (2048-bit key) header.d=deltatee.com header.i=@deltatee.com header.b=UDVrnMRq; arc=none smtp.client-ip=204.191.154.188 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=deltatee.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=deltatee.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=deltatee.com header.i=@deltatee.com header.b="UDVrnMRq" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=deltatee.com; s=20200525; h=Subject:MIME-Version:References:In-Reply-To: Message-ID:Date:Cc:To:From:content-disposition; bh=1Sc00LLbJ3B9EzEYCBr4PK/7bI/kLf3dvLcEogNQeHU=; b=UDVrnMRq69XtJCsImi2wVuvH+n 90Lw+g3FpD2ptOEgsLzgSuToFDcV9m8d0/KKYAHLCvv+rKH0SOanRCM053MptTSU8cooSw1q1nkrr z5fCUMAdsKwhUmnlI7i5EJvPiczkovi6s6KxARfZ1MZY8jr/CivtUBf5hHNwPTC9ZUjMR7qW9z9OV bs7nPtnCvHt59wuASjljARz/VbQ/qiIGKDVHZnjRQxD4/PsXFZ6s0uPb7AEB+aRjvivSId63uhc7x N4Ho7oN0xH/LpNjOo3CggyAujUlYoTGXlkyJGRHiD7eXo4oxKW7o2H4TdqqQS+RK4Jek4V2eZgsIa b2Mpytdw==; Received: from cgy1-donard.priv.deltatee.com ([172.16.1.31]) by ale.deltatee.com with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.98.2) (envelope-from ) id 1wmD2Y-0000000BodK-1fBB; Tue, 21 Jul 2026 10:09:55 -0600 Received: from gunthorp by cgy1-donard.priv.deltatee.com with local (Exim 4.98.2) (envelope-from ) id 1wmD2T-00000000GBK-34Y3; Tue, 21 Jul 2026 10:09:49 -0600 From: Logan Gunthorpe To: linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, dmaengine@vger.kernel.org, Vinod Koul Cc: Frank Li , Kelvin Cao , =?UTF-8?q?Thomas=20Wei=C3=9Fschuh?= , Dave Jiang , George Ge , Jaeyoung Chung , Logan Gunthorpe Date: Tue, 21 Jul 2026 09:57:28 -0600 Message-ID: <20260721155739.62120-2-logang@deltatee.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260721155739.62120-1-logang@deltatee.com> References: <20260721155739.62120-1-logang@deltatee.com> Precedence: bulk X-Mailing-List: dmaengine@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SA-Exim-Connect-IP: 172.16.1.31 X-SA-Exim-Rcpt-To: linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, dmaengine@vger.kernel.org, vkoul@kernel.org, Frank.li@nxp.com, linux@weissschuh.net, dave.jiang@intel.com, kelvin.cao@microchip.com, george.ge@microchip.com, jjy600901@snu.ac.kr, logang@deltatee.com X-SA-Exim-Mail-From: gunthorp@deltatee.com X-Spam-Level: Subject: [PATCH v2 01/11] dmaengine: switchtec-dma: fix double-free in switchtec_dma_free_desc() X-SA-Exim-Version: 4.2.1 (built Sun, 23 Feb 2025 07:57:16 +0000) X-SA-Exim-Scanned: Yes (on ale.deltatee.com) switchtec_dma_free_desc() frees swdma_chan->hw_sq, hw_cq, and every desc_ring[] entry without clearing the pointers afterward. If switchtec_dma_alloc_chan_resources() fails partway through and calls it during unwind, then a later retry of alloc_chan_resources() fails in switchtec_dma_alloc_desc() before reallocating one of those pointers, its own failure path calls switchtec_dma_free_desc() again and frees the same, already-freed pointers a second time. NULL out each pointer as it's freed so a subsequent call is a no-op for anything already released. Fixes: 30eba9df76ad ("dmaengine: switchtec-dma: Implement hardware initialization and cleanup") Signed-off-by: Logan Gunthorpe --- drivers/dma/switchtec_dma.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/dma/switchtec_dma.c b/drivers/dma/switchtec_dma.c index 3ef928640615..a4a7d66d042d 100644 --- a/drivers/dma/switchtec_dma.c +++ b/drivers/dma/switchtec_dma.c @@ -886,14 +886,18 @@ static void switchtec_dma_free_desc(struct switchtec_dma_chan *swdma_chan) if (swdma_chan->hw_sq) dma_free_coherent(swdma_dev->dma_dev.dev, size, swdma_chan->hw_sq, swdma_chan->dma_addr_sq); + swdma_chan->hw_sq = NULL; size = SWITCHTEC_DMA_CQ_SIZE * sizeof(*swdma_chan->hw_cq); if (swdma_chan->hw_cq) dma_free_coherent(swdma_dev->dma_dev.dev, size, swdma_chan->hw_cq, swdma_chan->dma_addr_cq); + swdma_chan->hw_cq = NULL; - for (i = 0; i < SWITCHTEC_DMA_RING_SIZE; i++) + for (i = 0; i < SWITCHTEC_DMA_RING_SIZE; i++) { kfree(swdma_chan->desc_ring[i]); + swdma_chan->desc_ring[i] = NULL; + } } static int switchtec_dma_alloc_desc(struct switchtec_dma_chan *swdma_chan) -- 2.47.3