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tools: ynl: make sure we always pass yarg to mnl_cb_run

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There is one common error handler in ynl - ynl_cb_error().
It expects priv to be a pointer to struct ynl_parse_arg AKA yarg.
To avoid potential crashes if we encounter a stray NLMSG_ERROR
always pass yarg as priv (or a struct which has it as the first
member).

ynl_cb_null() has a similar problem directly - it expects yarg
but priv passed by the caller is ys.

Found by code inspection.

Fixes: 86878f14d7 ("tools: ynl: user space helpers")
Acked-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Link: https://lore.kernel.org/r/20240220161112.2735195-2-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski 2024-02-20 08:11:11 -08:00
parent 9990889be1
commit e4fe082c38
1 changed files with 8 additions and 3 deletions
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11
tools/net/ynl/lib/ynl.c
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@ -466,6 +466,8 @@ ynl_gemsg_start_dump(struct ynl_sock *ys, __u32 id, __u8 cmd, __u8 version)
int ynl_recv_ack(struct ynl_sock *ys, int ret)
{
struct ynl_parse_arg yarg = { .ys = ys, };
if (!ret) {
yerr(ys, YNL_ERROR_EXPECT_ACK,
"Expecting an ACK but nothing received");
@ -478,7 +480,7 @@ int ynl_recv_ack(struct ynl_sock *ys, int ret)
return ret;
}
return mnl_cb_run(ys->rx_buf, ret, ys->seq, ys->portid,
ynl_cb_null, ys);
ynl_cb_null, &yarg);
}
int ynl_cb_null(const struct nlmsghdr *nlh, void *data)
@ -741,11 +743,14 @@ err_free:
static int ynl_ntf_trampoline(const struct nlmsghdr *nlh, void *data)
{
return ynl_ntf_parse((struct ynl_sock *)data, nlh);
struct ynl_parse_arg *yarg = data;
return ynl_ntf_parse(yarg->ys, nlh);
}
int ynl_ntf_check(struct ynl_sock *ys)
{
struct ynl_parse_arg yarg = { .ys = ys, };
ssize_t len;
int err;
@ -767,7 +772,7 @@ int ynl_ntf_check(struct ynl_sock *ys)
return len;
err = mnl_cb_run2(ys->rx_buf, len, ys->seq, ys->portid,
ynl_ntf_trampoline, ys,
ynl_ntf_trampoline, &yarg,
ynl_cb_array, NLMSG_MIN_TYPE);
if (err < 0)
return err;