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[177.4.161.87]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-12df8279e57sm2628939c88.3.2026.05.01.04.10.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 01 May 2026 04:10:53 -0700 (PDT) From: =?utf-8?q?C=C3=A1ssio_Gabriel?= Date: Fri, 01 May 2026 08:10:46 -0300 Subject: [PATCH] ALSA: usb-audio: qcom: Check offload mapping failures Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Message-Id: <20260501-alsa-usb-qcom-offload-map-errors-v1-1-ea927afd42c0@gmail.com> X-B4-Tracking: v=1; b=H4sIAAAAAAAC/yXNQQrCQAxA0auUrA3UQat4FXGRTDI60nZqYkUov bujLt/m/wVcLavDqVnA9JU9l7Fiu2kg3mi8KmaphtCGrt2FgNQ74eyMj1gGLCn1hQQHmlDNijm KMHfC6bA/EtTMZJry+7c4X/72me8an98urOsHUE9eJYQAAAA= X-Change-ID: 20260422-alsa-usb-qcom-offload-map-errors-ddbb6dbf758a To: Takashi Iwai , Greg Kroah-Hartman , Mark Brown , Wesley Cheng , Arnd Bergmann , Jaroslav Kysela Cc: linux-sound@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, =?utf-8?q?C=C3=A1ssio_Gabriel?= X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=3601; i=cassiogabrielcontato@gmail.com; h=from:subject:message-id; bh=3Wcuv7vWXril4wnR8nrnNGWz346GKjDN1CfiXRWaVXg=; b=owGbwMvMwCV2IdZeKur/u2bG02pJDJlfuqzO8G9h5Z947LPZmziJD2uVMuKFc/4kalTL1AWkH VMROK7YUcrCIMbFICumyLI6aZHlnq4HV+vjVnjAzGFlAhnCwMUpABPpCGT472Kx8WvbDn6bv4km hvy6u1mV18ycvGHp8oQOnTNPeuNrGxn+8MmFcRs4KrG+q5paZWDo7DfTW51vC/vpTdmqzGoGjdu ZAA== X-Developer-Key: i=cassiogabrielcontato@gmail.com; a=openpgp; fpr=AB62A239BC8AE0D57F5EA848D05D3F1A5AFFEE83 uaudio_transfer_buffer_setup() calls dma_get_sgtable() and then passes the sg_table to uaudio_iommu_map_xfer_buf() without checking whether sg table construction succeeded. If dma_get_sgtable() fails, the sg_table contents are not valid. uaudio_iommu_map_pa() also ignores iommu_map() failures for the event and transfer rings and still returns the allocated IOVA to the QMI response. That can expose an unmapped IOVA to the audio DSP. For transfer rings, the failed mapping also leaves the IOVA allocator state marked in use. Check both operations. Free the coherent transfer buffer when sg table construction fails, free the sg table when transfer-buffer IOMMU mapping fails, and release the transfer-ring IOVA if iommu_map() fails. Also return the existing event-ring IOVA when the event ring is already mapped, matching the pre-split helper behavior. Fixes: 326bbc348298 ("ALSA: usb-audio: qcom: Introduce QC USB SND offloading support") Fixes: 44499ecb4f28 ("ALSA: usb: qcom: Fix false-positive address space check") Cc: stable@vger.kernel.org Signed-off-by: Cássio Gabriel --- sound/usb/qcom/qc_audio_offload.c | 31 +++++++++++++++++++++++++------ 1 file changed, 25 insertions(+), 6 deletions(-) diff --git a/sound/usb/qcom/qc_audio_offload.c b/sound/usb/qcom/qc_audio_offload.c index 5f993b88448c..a0009503b2c5 100644 --- a/sound/usb/qcom/qc_audio_offload.c +++ b/sound/usb/qcom/qc_audio_offload.c @@ -565,6 +565,7 @@ static unsigned long uaudio_iommu_map_pa(enum mem_type mtype, bool dma_coherent, unsigned long iova = 0; bool map = true; int prot = uaudio_iommu_map_prot(dma_coherent); + int ret; switch (mtype) { case MEM_EVENT_RING: @@ -582,10 +583,24 @@ static unsigned long uaudio_iommu_map_pa(enum mem_type mtype, bool dma_coherent, dev_err(uaudio_qdev->data->dev, "unknown mem type %d\n", mtype); } - if (!iova || !map) + if (!iova) return 0; - iommu_map(uaudio_qdev->data->domain, iova, pa, size, prot, GFP_KERNEL); + if (!map) + return iova; + + ret = iommu_map(uaudio_qdev->data->domain, iova, pa, size, prot, + GFP_KERNEL); + if (ret) { + dev_err(uaudio_qdev->data->dev, + "failed to map %zu bytes at iova 0x%08lx: %d\n", + size, iova, ret); + if (mtype == MEM_XFER_RING) + uaudio_put_iova(iova, size, + &uaudio_qdev->xfer_ring_list, + &uaudio_qdev->xfer_ring_iova_size); + return 0; + } return iova; } @@ -1054,15 +1069,17 @@ static int uaudio_transfer_buffer_setup(struct snd_usb_substream *subs, if (!xfer_buf) return -ENOMEM; - dma_get_sgtable(subs->dev->bus->sysdev, &xfer_buf_sgt, xfer_buf, - xfer_buf_dma, len); + ret = dma_get_sgtable(subs->dev->bus->sysdev, &xfer_buf_sgt, xfer_buf, + xfer_buf_dma, len); + if (ret) + goto free_xfer_buf; /* map the physical buffer into sysdev as well */ xfer_buf_dma_sysdev = uaudio_iommu_map_xfer_buf(dma_coherent, len, &xfer_buf_sgt); if (!xfer_buf_dma_sysdev) { ret = -ENOMEM; - goto unmap_sync; + goto free_sgt; } mem_info->dma = xfer_buf_dma; @@ -1073,7 +1090,9 @@ static int uaudio_transfer_buffer_setup(struct snd_usb_substream *subs, return 0; -unmap_sync: +free_sgt: + sg_free_table(&xfer_buf_sgt); +free_xfer_buf: usb_free_coherent(subs->dev, len, xfer_buf, xfer_buf_dma); return ret; --- base-commit: ab4a88fdef2813446e3af179a708d024622ff4fa change-id: 20260422-alsa-usb-qcom-offload-map-errors-ddbb6dbf758a Best regards, -- Cássio Gabriel