{
   "containers": {
      "cna": {
         "providerMetadata": {
            "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038"
         },
         "descriptions": [
            {
               "lang": "en",
               "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: fix NULL pointer in channel unregistration function\n\n__dma_async_device_channel_register() can fail. In case of failure,\nchan->local is freed (with free_percpu()), and chan->local is nullified.\nWhen dma_async_device_unregister() is called (because of managed API or\nintentionally by DMA controller driver), channels are unconditionally\nunregistered, leading to this NULL pointer:\n[    1.318693] Unable to handle kernel NULL pointer dereference at virtual address 00000000000000d0\n[...]\n[    1.484499] Call trace:\n[    1.486930]  device_del+0x40/0x394\n[    1.490314]  device_unregister+0x20/0x7c\n[    1.494220]  __dma_async_device_channel_unregister+0x68/0xc0\n\nLook at dma_async_device_register() function error path, channel device\nunregistration is done only if chan->local is not NULL.\n\nThen add the same condition at the beginning of\n__dma_async_device_channel_unregister() function, to avoid NULL pointer\nissue whatever the API used to reach this function."
            }
         ],
         "affected": [
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "drivers/dma/dmaengine.c"
               ],
               "versions": [
                  {
                     "version": "d2fb0a043838",
                     "lessThan": "9de69732dde4",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "d2fb0a043838",
                     "lessThan": "047fce470412",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "d2fb0a043838",
                     "lessThan": "2ab32986a0b9",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "d2fb0a043838",
                     "lessThan": "7f0ccfad2031",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "d2fb0a043838",
                     "lessThan": "9263fd2a6348",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "d2fb0a043838",
                     "lessThan": "f5c24d94512f",
                     "status": "affected",
                     "versionType": "git"
                  }
               ]
            },
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "affected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "drivers/dma/dmaengine.c"
               ],
               "versions": [
                  {
                     "version": "5.6",
                     "status": "affected"
                  },
                  {
                     "version": "0",
                     "lessThan": "5.6",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.10.210",
                     "lessThanOrEqual": "5.10.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.15.149",
                     "lessThanOrEqual": "5.15.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.1.76",
                     "lessThanOrEqual": "6.1.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.6.15",
                     "lessThanOrEqual": "6.6.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.7.3",
                     "lessThanOrEqual": "6.7.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.8",
                     "lessThanOrEqual": "*",
                     "status": "unaffected",
                     "versionType": "original_commit_for_fix"
                  }
               ]
            }
         ],
         "references": [
            {
               "url": "https://git.kernel.org/stable/c/9de69732dde4e443c1c7f89acbbed2c45a6a8e17"
            },
            {
               "url": "https://git.kernel.org/stable/c/047fce470412ab64cb7345f9ff5d06919078ad79"
            },
            {
               "url": "https://git.kernel.org/stable/c/2ab32986a0b9e329eb7f8f04dd57cc127f797c08"
            },
            {
               "url": "https://git.kernel.org/stable/c/7f0ccfad2031eddcc510caf4e57f2d4aa2d8a50b"
            },
            {
               "url": "https://git.kernel.org/stable/c/9263fd2a63487c6d04cbb7b74a48fb12e1e352d0"
            },
            {
               "url": "https://git.kernel.org/stable/c/f5c24d94512f1b288262beda4d3dcb9629222fc7"
            }
         ],
         "title": "dmaengine: fix NULL pointer in channel unregistration function",
         "x_generator": {
            "engine": "bippy-a5840b7849dd"
         }
      }
   },
   "cveMetadata": {
      "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
      "cveID": "CVE-2023-52492",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}