net/sched: cls_api: Initialize miss_cookie_node when action miss is not used
authorIvan Vecera <ivecera@redhat.com>
Thu, 20 Apr 2023 18:36:33 +0000 (20:36 +0200)
committerJakub Kicinski <kuba@kernel.org>
Sat, 22 Apr 2023 03:25:57 +0000 (20:25 -0700)
commit2cc8a008d62f3c04eeb7ec6fe59e542802bb8df3
tree60761f3535115504207adb049fd5fdb6d9a8b3ea
parent7041101ff6c3073fd8f2e99920f535b111c929cb
net/sched: cls_api: Initialize miss_cookie_node when action miss is not used

Function tcf_exts_init_ex() sets exts->miss_cookie_node ptr only
when use_action_miss is true so it assumes in other case that
the field is set to NULL by the caller. If not then the field
contains garbage and subsequent tcf_exts_destroy() call results
in a crash.
Ensure that the field .miss_cookie_node pointer is NULL when
use_action_miss parameter is false to avoid this potential scenario.

Fixes: 80cd22c35c90 ("net/sched: cls_api: Support hardware miss to tc action")
Signed-off-by: Ivan Vecera <ivecera@redhat.com>
Reviewed-by: Pedro Tammela <pctammela@mojatatu.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Link: https://lore.kernel.org/r/20230420183634.1139391-1-ivecera@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
net/sched/cls_api.c