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genetlink: add explicit ordering break check for split ops

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Currently, if cmd in the split ops array is of lower value than the
previous one, genl_validate_ops() continues to do the checks as if
the values are equal. This may result in non-obvious WARN_ON() hit in
these check.

Instead, check the incorrect ordering explicitly and put a WARN_ON()
in case it is broken.

Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Link: https://lore.kernel.org/r/20230720111354.562242-1-jiri@resnulli.us
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jiri Pirko 2023-07-20 13:13:54 +02:00 committed by Jakub Kicinski
parent 070e8bd31b
commit 5766946ea5
1 changed files with 5 additions and 1 deletions
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6
net/netlink/genetlink.c
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@ -593,8 +593,12 @@ static int genl_validate_ops(const struct genl_family *family)
return -EINVAL;
/* Check sort order */
if (a->cmd < b->cmd)
if (a->cmd < b->cmd) {
continue;
} else if (a->cmd > b->cmd) {
WARN_ON(1);
return -EINVAL;
}
if (a->internal_flags != b->internal_flags ||
((a->flags ^ b->flags) & ~(GENL_CMD_CAP_DO |