smc: Use __sk_dst_get() and dst_dev_rcu() in in smc_clc_prfx_set().

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[ Upstream commit 935d783e5d ]

smc_clc_prfx_set() is called during connect() and not under RCU
nor RTNL.

Using sk_dst_get(sk)->dev could trigger UAF.

Let's use __sk_dst_get() and dev_dst_rcu() under rcu_read_lock()
after kernel_getsockname().

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

While at it, we change the 1st arg of smc_clc_prfx_set[46]_rcu()
not to touch dst there.

Fixes: a046d57da1 ("smc: CLC handshake (incl. preparation steps)")
Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20250916214758.650211-3-kuniyu@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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This commit is contained in:

Kuniyuki Iwashima 2025-09-16 21:47:20 +00:00 • committed by Greg Kroah-Hartman

parent 233927b645

commit 0736993bfe

1 changed files with 22 additions and 19 deletions

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net/smc/smc_clc.c

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