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Kuniyuki Iwashima 0b0e4d51c6 smc: Use __sk_dst_get() and dst_dev_rcu() in smc_vlan_by_tcpsk().
smc_vlan_by_tcpsk() fetches sk_dst_get(sk)->dev before RTNL and
passes it to netdev_walk_all_lower_dev(), which is illegal.

Also, smc_vlan_by_tcpsk_walk() does not require RTNL at all.

Let's use __sk_dst_get(), dst_dev_rcu(), and
netdev_walk_all_lower_dev_rcu().

Note that the returned value of smc_vlan_by_tcpsk() is not used
in the caller.

Fixes: 0cfdd8f92c ("smc: connection and link group creation")
Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20250916214758.650211-5-kuniyu@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
History 2025-09-17 18:10:22 -07:00
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Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.