CVE-2024-50260 — sock_map: fix a NULL pointer dereference in sock_map_link_update_prog()

Affected: Linux

In the Linux kernel, the following vulnerability has been resolved:

sock_map: fix a NULL pointer dereference in sock_map_link_update_prog()

The following race condition could trigger a NULL pointer dereference:

sock_map_link_detach(): sock_map_link_update_prog(): mutex_lock(&sockmap_mutex); ... sockmap_link->map = NULL; mutex_unlock(&sockmap_mutex); mutex_lock(&sockmap_mutex); ... sock_map_prog_link_lookup(sockmap_link->map); mutex_unlock(&sockmap_mutex); <continue>

Fix it by adding a NULL pointer check. In this specific case, it makes no sense to update a link which is being released.

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CVE-2024-50260 — sock_map: fix a NULL pointer dereference in sock_map_link_update_prog()