XingWang Xiang 6a1094c34d genetlink: pin family module during policy dump ...

The generic netlink controller's policy dump keeps pointers to the target
family's operation and policy tables in its callback state.  A dump may be
split across multiple skbs and remain pending after the initial request.

Netlink pins the module which owns the dump callback, but in this case
that is the controller's owner rather than the target family's owner.  The
target family can consequently be unregistered and its module unloaded
while a policy dump is pending.  Advancing the dump then dereferences
policy memory from the unloaded module.

Take a reference to the target family's module when the dump starts.
Drop it from the error and done paths.  This matches the lifetime for which
the dump context retains the family and policy pointers.

Fixes: d07dcf9aad ("netlink: add infrastructure to expose policies to userspace")
Cc: stable@vger.kernel.org
Signed-off-by: XingWang Xiang <v3rdant.xiang@gmail.com>
Link: https://patch.msgid.link/20260902084317.4092542-1-v3rdant.xiang@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

2026-09-03 17:21:35 -07:00

..

af_netlink.c

netlink: drop unneeded semicolon

2026-08-05 17:32:34 -07:00

af_netlink.h

netlink: terminate outstanding dump on socket close

2024-11-07 13:45:34 -08:00

diag.c

net: change sock.sk_ino and sock_i_ino() to u64

2026-03-06 14:31:26 +01:00

genetlink.c

genetlink: pin family module during policy dump

2026-09-03 17:21:35 -07:00

genetlink.h

netlink: create a new header for internal genetlink symbols

2024-04-01 21:44:34 -07:00

Kconfig

treewide: replace '---help---' in Kconfig files with 'help'

2020-06-14 01:57:21 +09:00

Makefile

netlink: add infrastructure to expose policies to userspace

2020-04-30 17:51:42 -07:00

policy.c

genetlink: use maxattr of 0 for the reject policy

2026-03-12 18:02:13 -07:00