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| author | Sabrina Dubroca <sd@queasysnail.net> | 2017-12-31 16:18:56 +0100 |
|---|---|---|
| committer | Steffen Klassert <steffen.klassert@secunet.com> | 2017-12-31 16:29:24 +0100 |
| commit | 2f10a61cee8fdb9f8da90f5db687e1862b22cf06 (patch) | |
| tree | ce6216dcf1b159f1c63a130778fe81105a3bd8fb /net/xfrm/xfrm_state.c | |
| parent | 4e765b4972af7b07adcb1feb16e7a525ce1f6b28 (diff) | |
| download | linux-2f10a61cee8fdb9f8da90f5db687e1862b22cf06.tar.gz | |
xfrm: fix rcu usage in xfrm_get_type_offload
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: ffdb5211da1c ("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>
Diffstat (limited to 'net/xfrm/xfrm_state.c')
| -rw-r--r-- | net/xfrm/xfrm_state.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c index 1e80f68e2266..429957412633 100644 --- a/net/xfrm/xfrm_state.c +++ b/net/xfrm/xfrm_state.c @@ -313,13 +313,14 @@ retry: if ((type && !try_module_get(type->owner))) type = NULL; + rcu_read_unlock(); + if (!type && try_load) { request_module("xfrm-offload-%d-%d", family, proto); try_load = 0; goto retry; } - rcu_read_unlock(); return type; } |