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| author |   Tom Herbert <tom@quantonium.net> | 2018-01-24 12:35:41 -0800 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2018-01-24 15:54:30 -0500 |
| commit | e5571240236c5652f3e079b1d5866716a7ad819c (patch) | |
| tree | 1541ccbaf77a4b034f515865927e175bb7e00bc0 /net/mac80211 | |
| parent | kcm: Only allow TCP sockets to be attached to a KCM mux (diff) | |
| download | linux-dev-e5571240236c5652f3e079b1d5866716a7ad819c.tar.xz linux-dev-e5571240236c5652f3e079b1d5866716a7ad819c.zip | |
kcm: Check if sk_user_data already set in kcm_attach
This is needed to prevent sk_user_data being overwritten.
The check is done under the callback lock. This should prevent
a socket from being attached twice to a KCM mux. It also prevents
a socket from being attached for other use cases of sk_user_data
as long as the other cases set sk_user_data under the lock.
Followup work is needed to unify all the use cases of sk_user_data
to use the same locking.
Reported-by: syzbot+114b15f2be420a8886c3@syzkaller.appspotmail.com
Fixes: ab7ac4eb9832 ("kcm: Kernel Connection Multiplexor module")
Signed-off-by: Tom Herbert <tom@quantonium.net>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/mac80211')
0 files changed, 0 insertions, 0 deletions