xfrm: fix rcu usage in xfrm_get_type_offload

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commit 2f10a61cee upstream.

request_module can sleep, thus we cannot hold rcu_read_lock() while
calling it. The function also jumps back and takes rcu_read_lock()
again (in xfrm_state_get_afinfo()), resulting in an imbalance.

This codepath is triggered whenever a new offloaded state is created.

Fixes: ffdb5211da ("xfrm: Auto-load xfrm offload modules")
Reported-by: syzbot+ca425f44816d749e8eb49755567a75ee48cf4a30@syzkaller.appspotmail.com
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Sabrina Dubroca 2017-12-31 16:18:56 +01:00 • committed by Greg Kroah-Hartman

parent 85c31887a2

commit e8370258ca

1 changed files with 2 additions and 1 deletions

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net/xfrm/xfrm_state.c

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