CVE-2022-50459 (GCVE-0-2022-50459)

Vulnerability from cvelistv5 – Published: 2025-10-01 11:45 – Updated: 2025-10-01 11:45
VLAI?
Title
scsi: iscsi: iscsi_tcp: Fix null-ptr-deref while calling getpeername()
Summary
In the Linux kernel, the following vulnerability has been resolved: scsi: iscsi: iscsi_tcp: Fix null-ptr-deref while calling getpeername() Fix a NULL pointer crash that occurs when we are freeing the socket at the same time we access it via sysfs. The problem is that: 1. iscsi_sw_tcp_conn_get_param() and iscsi_sw_tcp_host_get_param() take the frwd_lock and do sock_hold() then drop the frwd_lock. sock_hold() does a get on the "struct sock". 2. iscsi_sw_tcp_release_conn() does sockfd_put() which does the last put on the "struct socket" and that does __sock_release() which sets the sock->ops to NULL. 3. iscsi_sw_tcp_conn_get_param() and iscsi_sw_tcp_host_get_param() then call kernel_getpeername() which accesses the NULL sock->ops. Above we do a get on the "struct sock", but we needed a get on the "struct socket". Originally, we just held the frwd_lock the entire time but in commit bcf3a2953d36 ("scsi: iscsi: iscsi_tcp: Avoid holding spinlock while calling getpeername()") we switched to refcount based because the network layer changed and started taking a mutex in that path, so we could no longer hold the frwd_lock. Instead of trying to maintain multiple refcounts, this just has us use a mutex for accessing the socket in the interface code paths.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: bcf3a2953d36bbfb9bd44ccb3db0897d935cc485 , < 884a788f065578bb640382279a83d1df433b13e6 (git)
Affected: bcf3a2953d36bbfb9bd44ccb3db0897d935cc485 , < a26b0658751bb0a3b28386fca715333b104d32a2 (git)
Affected: bcf3a2953d36bbfb9bd44ccb3db0897d935cc485 , < 897dbbc57d71e8a34ec1af8e573a142de457da38 (git)
Affected: bcf3a2953d36bbfb9bd44ccb3db0897d935cc485 , < 0a0b861fce2657ba08ec356a74346b37ca4b2008 (git)
Affected: bcf3a2953d36bbfb9bd44ccb3db0897d935cc485 , < 57569c37f0add1b6489e1a1563c71519daf732cf (git)
Affected: 7d29e950766327f658cb92722b9445ac3b3ae023 (git)
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    Linux Linux Affected: 5.9
Unaffected: 0 , < 5.9 (semver)
Unaffected: 5.10.150 , ≤ 5.10.* (semver)
Unaffected: 5.15.75 , ≤ 5.15.* (semver)
Unaffected: 5.19.17 , ≤ 5.19.* (semver)
Unaffected: 6.0.3 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: iscsi: iscsi_tcp: Fix null-ptr-deref while calling getpeername()\n\nFix a NULL pointer crash that occurs when we are freeing the socket at the\nsame time we access it via sysfs.\n\nThe problem is that:\n\n 1. iscsi_sw_tcp_conn_get_param() and iscsi_sw_tcp_host_get_param() take\n    the frwd_lock and do sock_hold() then drop the frwd_lock. sock_hold()\n    does a get on the \"struct sock\".\n\n 2. iscsi_sw_tcp_release_conn() does sockfd_put() which does the last put\n    on the \"struct socket\" and that does __sock_release() which sets the\n    sock-\u003eops to NULL.\n\n 3. iscsi_sw_tcp_conn_get_param() and iscsi_sw_tcp_host_get_param() then\n    call kernel_getpeername() which accesses the NULL sock-\u003eops.\n\nAbove we do a get on the \"struct sock\", but we needed a get on the \"struct\nsocket\". Originally, we just held the frwd_lock the entire time but in\ncommit bcf3a2953d36 (\"scsi: iscsi: iscsi_tcp: Avoid holding spinlock while\ncalling getpeername()\") we switched to refcount based because the network\nlayer changed and started taking a mutex in that path, so we could no\nlonger hold the frwd_lock.\n\nInstead of trying to maintain multiple refcounts, this just has us use a\nmutex for accessing the socket in the interface code paths."
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        "dateUpdated": "2025-10-01T11:45:31.740Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "title": "scsi: iscsi: iscsi_tcp: Fix null-ptr-deref while calling getpeername()",
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    "dateReserved": "2025-10-01T11:38:45.640Z",
    "dateUpdated": "2025-10-01T11:45:31.740Z",
    "state": "PUBLISHED"
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}


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