CVE-2022-50145 (GCVE-0-2022-50145)
Vulnerability from cvelistv5
Published
2025-06-18 11:03
Modified
2025-06-18 11:03
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: dmaengine: sf-pdma: Add multithread support for a DMA channel When we get a DMA channel and try to use it in multiple threads it will cause oops and hanging the system. % echo 64 > /sys/module/dmatest/parameters/threads_per_chan % echo 10000 > /sys/module/dmatest/parameters/iterations % echo 1 > /sys/module/dmatest/parameters/run [ 89.480664] Unable to handle kernel NULL pointer dereference at virtual address 00000000000000a0 [ 89.488725] Oops [#1] [ 89.494708] CPU: 2 PID: 1008 Comm: dma0chan0-copy0 Not tainted 5.17.0-rc5 [ 89.509385] epc : vchan_find_desc+0x32/0x46 [ 89.513553] ra : sf_pdma_tx_status+0xca/0xd6 This happens because of data race. Each thread rewrite channels's descriptor as soon as device_prep_dma_memcpy() is called. It leads to the situation when the driver thinks that it uses right descriptor that actually is freed or substituted for other one. With current fixes a descriptor changes its value only when it has been used. A new descriptor is acquired from vc->desc_issued queue that is already filled with descriptors that are ready to be sent. Threads have no direct access to DMA channel descriptor. Now it is just possible to queue a descriptor for further processing.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4c7350b1dd8a192af844de32fc99b9e34c876fda
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5ab2782c944e324008ef5d658f2494a9f0e3c5ac
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a93b3f1e11971a91b6441b6d47488f4492cc113f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b2cc5c465c2cb8ab697c3fd6583c614e3f6cfbcc
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b9b4992f897be9b0b9e3a3b956cab6b75ccc3f11
Impacted products
Vendor Product Version
Linux Linux Version: 6973886ad58e6b4988813331abb76ae0b364a9c2
Version: 6973886ad58e6b4988813331abb76ae0b364a9c2
Version: 6973886ad58e6b4988813331abb76ae0b364a9c2
Version: 6973886ad58e6b4988813331abb76ae0b364a9c2
Version: 6973886ad58e6b4988813331abb76ae0b364a9c2
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   Linux Linux Version: 5.5
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/dma/sf-pdma/sf-pdma.c"
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          "vendor": "Linux",
          "versions": [
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              "version": "0",
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              "version": "5.19.2",
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              "status": "unaffected",
              "version": "6.0",
              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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          "nodes": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: sf-pdma: Add multithread support for a DMA channel\n\nWhen we get a DMA channel and try to use it in multiple threads it\nwill cause oops and hanging the system.\n\n% echo 64 \u003e /sys/module/dmatest/parameters/threads_per_chan\n% echo 10000 \u003e /sys/module/dmatest/parameters/iterations\n% echo 1 \u003e /sys/module/dmatest/parameters/run\n[   89.480664] Unable to handle kernel NULL pointer dereference at virtual\n               address 00000000000000a0\n[   89.488725] Oops [#1]\n[   89.494708] CPU: 2 PID: 1008 Comm: dma0chan0-copy0 Not tainted\n               5.17.0-rc5\n[   89.509385] epc : vchan_find_desc+0x32/0x46\n[   89.513553]  ra : sf_pdma_tx_status+0xca/0xd6\n\nThis happens because of data race. Each thread rewrite channels\u0027s\ndescriptor as soon as device_prep_dma_memcpy() is called. It leads to the\nsituation when the driver thinks that it uses right descriptor that\nactually is freed or substituted for other one.\n\nWith current fixes a descriptor changes its value only when it has\nbeen used. A new descriptor is acquired from vc-\u003edesc_issued queue that\nis already filled with descriptors that are ready to be sent. Threads\nhave no direct access to DMA channel descriptor. Now it is just possible\nto queue a descriptor for further processing."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-06-18T11:03:06.312Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/5ab2782c944e324008ef5d658f2494a9f0e3c5ac"
        },
        {
          "url": "https://git.kernel.org/stable/c/4c7350b1dd8a192af844de32fc99b9e34c876fda"
        },
        {
          "url": "https://git.kernel.org/stable/c/a93b3f1e11971a91b6441b6d47488f4492cc113f"
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        {
          "url": "https://git.kernel.org/stable/c/b2cc5c465c2cb8ab697c3fd6583c614e3f6cfbcc"
        }
      ],
      "title": "dmaengine: sf-pdma: Add multithread support for a DMA channel",
      "x_generator": {
        "engine": "bippy-1.2.0"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50145",
    "datePublished": "2025-06-18T11:03:06.312Z",
    "dateReserved": "2025-06-18T10:57:27.424Z",
    "dateUpdated": "2025-06-18T11:03:06.312Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50145\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-06-18T11:15:44.527\",\"lastModified\":\"2025-06-18T13:47:40.833\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ndmaengine: sf-pdma: Add multithread support for a DMA channel\\n\\nWhen we get a DMA channel and try to use it in multiple threads it\\nwill cause oops and hanging the system.\\n\\n% echo 64 \u003e /sys/module/dmatest/parameters/threads_per_chan\\n% echo 10000 \u003e /sys/module/dmatest/parameters/iterations\\n% echo 1 \u003e /sys/module/dmatest/parameters/run\\n[   89.480664] Unable to handle kernel NULL pointer dereference at virtual\\n               address 00000000000000a0\\n[   89.488725] Oops [#1]\\n[   89.494708] CPU: 2 PID: 1008 Comm: dma0chan0-copy0 Not tainted\\n               5.17.0-rc5\\n[   89.509385] epc : vchan_find_desc+0x32/0x46\\n[   89.513553]  ra : sf_pdma_tx_status+0xca/0xd6\\n\\nThis happens because of data race. Each thread rewrite channels\u0027s\\ndescriptor as soon as device_prep_dma_memcpy() is called. It leads to the\\nsituation when the driver thinks that it uses right descriptor that\\nactually is freed or substituted for other one.\\n\\nWith current fixes a descriptor changes its value only when it has\\nbeen used. A new descriptor is acquired from vc-\u003edesc_issued queue that\\nis already filled with descriptors that are ready to be sent. Threads\\nhave no direct access to DMA channel descriptor. Now it is just possible\\nto queue a descriptor for further processing.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/4c7350b1dd8a192af844de32fc99b9e34c876fda\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5ab2782c944e324008ef5d658f2494a9f0e3c5ac\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a93b3f1e11971a91b6441b6d47488f4492cc113f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b2cc5c465c2cb8ab697c3fd6583c614e3f6cfbcc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b9b4992f897be9b0b9e3a3b956cab6b75ccc3f11\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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