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| author | Michal Luczaj <[email protected]> | 2025-06-09 17:08:03 +0000 |
|---|---|---|
| committer | Jakub Kicinski <[email protected]> | 2025-06-10 22:31:28 +0000 |
| commit | 2660a544fdc0940bba15f70508a46cf9a6491230 (patch) | |
| tree | 5bf9d18c3c58a5af969dd71fd5dd999ed50e6f51 /drivers/net/netconsole.c | |
| parent | net: usb: r8152: Add device ID for TP-Link UE200 (diff) | |
| download | kernel-2660a544fdc0940bba15f70508a46cf9a6491230.tar.gz kernel-2660a544fdc0940bba15f70508a46cf9a6491230.zip | |
net: Fix TOCTOU issue in sk_is_readable()
sk->sk_prot->sock_is_readable is a valid function pointer when sk resides
in a sockmap. After the last sk_psock_put() (which usually happens when
socket is removed from sockmap), sk->sk_prot gets restored and
sk->sk_prot->sock_is_readable becomes NULL.
This makes sk_is_readable() racy, if the value of sk->sk_prot is reloaded
after the initial check. Which in turn may lead to a null pointer
dereference.
Ensure the function pointer does not turn NULL after the check.
Fixes: 8934ce2fd081 ("bpf: sockmap redirect ingress support")
Suggested-by: Jakub Sitnicki <[email protected]>
Signed-off-by: Michal Luczaj <[email protected]>
Reviewed-by: Willem de Bruijn <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>
Diffstat (limited to 'drivers/net/netconsole.c')
0 files changed, 0 insertions, 0 deletions