{"id":"CVE-2022-50728","summary":"s390/lcs: Fix return type of lcs_start_xmit()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ns390/lcs: Fix return type of lcs_start_xmit()\n\nWith clang's 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 '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]\n          .ndo_start_xmit         = lcs_start_xmit,\n                                    ^~~~~~~~~~~~~~\n  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]\n          .ndo_start_xmit         = lcs_start_xmit,\n                                    ^~~~~~~~~~~~~~\n\n-\u003endo_start_xmit() in 'struct net_device_ops' expects a return type of\n'netdev_tx_t', not 'int'. Adjust the return type of lcs_start_xmit() to\nmatch the prototype's to resolve the warning and potential CFI failure,\nshould s390 select ARCH_SUPPORTS_CFI_CLANG in the future.","modified":"2026-03-20T11:47:36.126047Z","published":"2025-12-24T12:22:49.001Z","related":["SUSE-SU-2026:0263-1","SUSE-SU-2026:0316-1","SUSE-SU-2026:0317-1","SUSE-SU-2026:0411-1","SUSE-SU-2026:0617-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50728.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/20022d551f2064a194d8e0acb6cd7a85094a17b2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5ad774fb823c24bbeb21a15a67103ea7a6f5b928"},{"type":"WEB","url":"https://git.kernel.org/stable/c/69669820844f81a77b6db24b86581320ae4d17af"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7b4da3fcd513b8e67823eb80da37aad99b3339c1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/bb16db8393658e0978c3f0d30ae069e878264fa3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/cda74cdc280ba35c8993e7517bac5c257ff36f18"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d49cc2b705711fb8fb849e7c660929b2100360b7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e684215d8a903752e2b0cc946517fb61e57a880a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ebc3c77785dc8b5b626309c0032a38fbb139287a"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50728.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-50728"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"dc1f8bf68b311b1537cb65893430b6796118498a"},{"fixed":"7b4da3fcd513b8e67823eb80da37aad99b3339c1"},{"fixed":"d49cc2b705711fb8fb849e7c660929b2100360b7"},{"fixed":"e684215d8a903752e2b0cc946517fb61e57a880a"},{"fixed":"20022d551f2064a194d8e0acb6cd7a85094a17b2"},{"fixed":"ebc3c77785dc8b5b626309c0032a38fbb139287a"},{"fixed":"5ad774fb823c24bbeb21a15a67103ea7a6f5b928"},{"fixed":"69669820844f81a77b6db24b86581320ae4d17af"},{"fixed":"cda74cdc280ba35c8993e7517bac5c257ff36f18"},{"fixed":"bb16db8393658e0978c3f0d30ae069e878264fa3"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2022-50728.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.32"},{"fixed":"4.9.337"}]},{"type":"ECOSYSTEM","events":[{"introduced":"4.10.0"},{"fixed":"4.14.303"}]},{"type":"ECOSYSTEM","events":[{"introduced":"4.15.0"},{"fixed":"4.19.270"}]},{"type":"ECOSYSTEM","events":[{"introduced":"4.20.0"},{"fixed":"5.4.229"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.5.0"},{"fixed":"5.10.163"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.86"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.0.16"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.1.0"},{"fixed":"6.1.2"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2022-50728.json"}}],"schema_version":"1.7.5"}