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| author | Jakub Kicinski <kuba@kernel.org> | 2022-11-08 23:41:28 +0300 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2022-11-09 21:26:51 +0300 |
| commit | 154ba79c9f160e652a2c9c46435b928b3bfae11f (patch) | |
| tree | 6f3e70405f7f9f7d3443f0ca80b0e59a5d6e70c9 /net/netlink/genetlink.c | |
| parent | 3ca6c3b43c72a5fd0399d9ee1c7e5af978895ff1 (diff) | |
| download | linux-154ba79c9f160e652a2c9c46435b928b3bfae11f.tar.xz | |
genetlink: correctly begin the iteration over policies
The return value from genl_op_iter_init() only tells us if
there are any policies but to begin the iteration (and therefore
load the first entry) we need to call genl_op_iter_next().
Note that it's safe to call genl_op_iter_next() on a family
with no ops, it will just return false.
This may lead to various crashes, a warning in
netlink_policy_dump_get_policy_idx() when policy is not found
or.. no problem at all if the kmalloc'ed memory happens to be
zeroed.
Fixes: b502b3185cd6 ("genetlink: use iterator in the op to policy map dumping")
Link: https://lore.kernel.org/r/20221108204128.330287-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/netlink/genetlink.c')
| -rw-r--r-- | net/netlink/genetlink.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c index 362a61179036..9b7dfc45dd67 100644 --- a/net/netlink/genetlink.c +++ b/net/netlink/genetlink.c @@ -1437,7 +1437,9 @@ static int ctrl_dumppolicy_start(struct netlink_callback *cb) ctx->op_iter = kmalloc(sizeof(*ctx->op_iter), GFP_KERNEL); if (!ctx->op_iter) return -ENOMEM; - ctx->dump_map = genl_op_iter_init(rt, ctx->op_iter); + + genl_op_iter_init(rt, ctx->op_iter); + ctx->dump_map = genl_op_iter_next(ctx->op_iter); for (genl_op_iter_init(rt, &i); genl_op_iter_next(&i); ) { if (i.doit.policy) { |