CVE-2022-50728 (GCVE-0-2022-50728)

Vulnerability from cvelistv5 – Published: 2025-12-24 12:22 – Updated: 2025-12-24 12:22
VLAI?
Title
s390/lcs: Fix return type of lcs_start_xmit()
Summary
In the Linux kernel, the following vulnerability has been resolved: s390/lcs: Fix return type of lcs_start_xmit() With clang's kernel control flow integrity (kCFI, CONFIG_CFI_CLANG), indirect call targets are validated against the expected function pointer prototype to make sure the call target is valid to help mitigate ROP attacks. If they are not identical, there is a failure at run time, which manifests as either a kernel panic or thread getting killed. A proposed warning in clang aims to catch these at compile time, which reveals: drivers/s390/net/lcs.c:2090:21: error: incompatible function pointer types initializing 'netdev_tx_t (*)(struct sk_buff *, struct net_device *)' (aka 'enum netdev_tx (*)(struct sk_buff *, struct net_device *)') with an expression of type 'int (struct sk_buff *, struct net_device *)' [-Werror,-Wincompatible-function-pointer-types-strict] .ndo_start_xmit = lcs_start_xmit, ^~~~~~~~~~~~~~ drivers/s390/net/lcs.c:2097:21: error: incompatible function pointer types initializing 'netdev_tx_t (*)(struct sk_buff *, struct net_device *)' (aka 'enum netdev_tx (*)(struct sk_buff *, struct net_device *)') with an expression of type 'int (struct sk_buff *, struct net_device *)' [-Werror,-Wincompatible-function-pointer-types-strict] .ndo_start_xmit = lcs_start_xmit, ^~~~~~~~~~~~~~ ->ndo_start_xmit() in 'struct net_device_ops' expects a return type of 'netdev_tx_t', not 'int'. Adjust the return type of lcs_start_xmit() to match the prototype's to resolve the warning and potential CFI failure, should s390 select ARCH_SUPPORTS_CFI_CLANG in the future.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 7b4da3fcd513b8e67823eb80da37aad99b3339c1 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < d49cc2b705711fb8fb849e7c660929b2100360b7 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < e684215d8a903752e2b0cc946517fb61e57a880a (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 20022d551f2064a194d8e0acb6cd7a85094a17b2 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < ebc3c77785dc8b5b626309c0032a38fbb139287a (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 5ad774fb823c24bbeb21a15a67103ea7a6f5b928 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 69669820844f81a77b6db24b86581320ae4d17af (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < cda74cdc280ba35c8993e7517bac5c257ff36f18 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < bb16db8393658e0978c3f0d30ae069e878264fa3 (git)
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    Linux Linux Unaffected: 4.9.337 , ≤ 4.9.* (semver)
Unaffected: 4.14.303 , ≤ 4.14.* (semver)
Unaffected: 4.19.270 , ≤ 4.19.* (semver)
Unaffected: 5.4.229 , ≤ 5.4.* (semver)
Unaffected: 5.10.163 , ≤ 5.10.* (semver)
Unaffected: 5.15.86 , ≤ 5.15.* (semver)
Unaffected: 6.0.16 , ≤ 6.0.* (semver)
Unaffected: 6.1.2 , ≤ 6.1.* (semver)
Unaffected: 6.2 , ≤ * (original_commit_for_fix)
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{
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/lcs: Fix return type of lcs_start_xmit()\n\nWith clang\u0027s kernel control flow integrity (kCFI, CONFIG_CFI_CLANG),\nindirect call targets are validated against the expected function\npointer prototype to make sure the call target is valid to help mitigate\nROP attacks. If they are not identical, there is a failure at run time,\nwhich manifests as either a kernel panic or thread getting killed. A\nproposed warning in clang aims to catch these at compile time, which\nreveals:\n\n  drivers/s390/net/lcs.c:2090:21: error: incompatible function pointer types initializing \u0027netdev_tx_t (*)(struct sk_buff *, struct net_device *)\u0027 (aka \u0027enum netdev_tx (*)(struct sk_buff *, struct net_device *)\u0027) with an expression of type \u0027int (struct sk_buff *, struct net_device *)\u0027 [-Werror,-Wincompatible-function-pointer-types-strict]\n          .ndo_start_xmit         = lcs_start_xmit,\n                                    ^~~~~~~~~~~~~~\n  drivers/s390/net/lcs.c:2097:21: error: incompatible function pointer types initializing \u0027netdev_tx_t (*)(struct sk_buff *, struct net_device *)\u0027 (aka \u0027enum netdev_tx (*)(struct sk_buff *, struct net_device *)\u0027) with an expression of type \u0027int (struct sk_buff *, struct net_device *)\u0027 [-Werror,-Wincompatible-function-pointer-types-strict]\n          .ndo_start_xmit         = lcs_start_xmit,\n                                    ^~~~~~~~~~~~~~\n\n-\u003endo_start_xmit() in \u0027struct net_device_ops\u0027 expects a return type of\n\u0027netdev_tx_t\u0027, not \u0027int\u0027. Adjust the return type of lcs_start_xmit() to\nmatch the prototype\u0027s to resolve the warning and potential CFI failure,\nshould s390 select ARCH_SUPPORTS_CFI_CLANG in the future."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-24T12:22:49.001Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/d49cc2b705711fb8fb849e7c660929b2100360b7"
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          "url": "https://git.kernel.org/stable/c/20022d551f2064a194d8e0acb6cd7a85094a17b2"
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        },
        {
          "url": "https://git.kernel.org/stable/c/bb16db8393658e0978c3f0d30ae069e878264fa3"
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      "title": "s390/lcs: Fix return type of lcs_start_xmit()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50728",
    "datePublished": "2025-12-24T12:22:49.001Z",
    "dateReserved": "2025-12-24T12:20:40.330Z",
    "dateUpdated": "2025-12-24T12:22:49.001Z",
    "state": "PUBLISHED"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50728\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-24T13:15:59.463\",\"lastModified\":\"2025-12-24T13:15:59.463\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ns390/lcs: Fix return type of lcs_start_xmit()\\n\\nWith clang\u0027s kernel control flow integrity (kCFI, CONFIG_CFI_CLANG),\\nindirect call targets are validated against the expected function\\npointer prototype to make sure the call target is valid to help mitigate\\nROP attacks. If they are not identical, there is a failure at run time,\\nwhich manifests as either a kernel panic or thread getting killed. A\\nproposed warning in clang aims to catch these at compile time, which\\nreveals:\\n\\n  drivers/s390/net/lcs.c:2090:21: error: incompatible function pointer types initializing \u0027netdev_tx_t (*)(struct sk_buff *, struct net_device *)\u0027 (aka \u0027enum netdev_tx (*)(struct sk_buff *, struct net_device *)\u0027) with an expression of type \u0027int (struct sk_buff *, struct net_device *)\u0027 [-Werror,-Wincompatible-function-pointer-types-strict]\\n          .ndo_start_xmit         = lcs_start_xmit,\\n                                    ^~~~~~~~~~~~~~\\n  drivers/s390/net/lcs.c:2097:21: error: incompatible function pointer types initializing \u0027netdev_tx_t (*)(struct sk_buff *, struct net_device *)\u0027 (aka \u0027enum netdev_tx (*)(struct sk_buff *, struct net_device *)\u0027) with an expression of type \u0027int (struct sk_buff *, struct net_device *)\u0027 [-Werror,-Wincompatible-function-pointer-types-strict]\\n          .ndo_start_xmit         = lcs_start_xmit,\\n                                    ^~~~~~~~~~~~~~\\n\\n-\u003endo_start_xmit() in \u0027struct net_device_ops\u0027 expects a return type of\\n\u0027netdev_tx_t\u0027, not \u0027int\u0027. Adjust the return type of lcs_start_xmit() to\\nmatch the prototype\u0027s to resolve the warning and potential CFI failure,\\nshould s390 select ARCH_SUPPORTS_CFI_CLANG in the future.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/20022d551f2064a194d8e0acb6cd7a85094a17b2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5ad774fb823c24bbeb21a15a67103ea7a6f5b928\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/69669820844f81a77b6db24b86581320ae4d17af\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7b4da3fcd513b8e67823eb80da37aad99b3339c1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bb16db8393658e0978c3f0d30ae069e878264fa3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cda74cdc280ba35c8993e7517bac5c257ff36f18\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d49cc2b705711fb8fb849e7c660929b2100360b7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e684215d8a903752e2b0cc946517fb61e57a880a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ebc3c77785dc8b5b626309c0032a38fbb139287a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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