This is a note to let you know that I've just added the patch titled xfrm: Fix xfrm migrate issues when address family changes to the 4.19-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: xfrm-fix-xfrm-migrate-issues-when-address-family-cha.patch and it can be found in the queue-4.19 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 17a6afea452029afa79f50c78ea36baac1607cec Author: Yan Yan <evitayan@xxxxxxxxxx> Date: Tue Jan 18 16:00:14 2022 -0800 xfrm: Fix xfrm migrate issues when address family changes [ Upstream commit e03c3bba351f99ad932e8f06baa9da1afc418e02 ] xfrm_migrate cannot handle address family change of an xfrm_state. The symptons are the xfrm_state will be migrated to a wrong address, and sending as well as receiving packets wil be broken. This commit fixes it by breaking the original xfrm_state_clone method into two steps so as to update the props.family before running xfrm_init_state. As the result, xfrm_state's inner mode, outer mode, type and IP header length in xfrm_state_migrate can be updated with the new address family. Tested with additions to Android's kernel unit test suite: https://android-review.googlesource.com/c/kernel/tests/+/1885354 Signed-off-by: Yan Yan <evitayan@xxxxxxxxxx> Signed-off-by: Steffen Klassert <steffen.klassert@xxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c index 0fd67d1acbfb..cf147e1837a9 100644 --- a/net/xfrm/xfrm_state.c +++ b/net/xfrm/xfrm_state.c @@ -1442,9 +1442,6 @@ static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig, memcpy(&x->mark, &orig->mark, sizeof(x->mark)); memcpy(&x->props.smark, &orig->props.smark, sizeof(x->props.smark)); - if (xfrm_init_state(x) < 0) - goto error; - x->props.flags = orig->props.flags; x->props.extra_flags = orig->props.extra_flags; @@ -1528,6 +1525,11 @@ struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x, if (!xc) return NULL; + xc->props.family = m->new_family; + + if (xfrm_init_state(xc) < 0) + goto error; + memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr)); memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr));