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authorAndy Grover <agrover@redhat.com>2014-04-04 16:44:37 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-05-06 07:55:30 -0700
commit9e2dcd00681f852c1cb1864f79e9992ea1b5981f (patch)
treef3dc517b7564c28a102c9496d24db9ad455ac912 /drivers/target
parent95c1229d8dab9e43a9567c353ea19be908c14cb3 (diff)
downloadlinux-linaro-stable-9e2dcd00681f852c1cb1864f79e9992ea1b5981f.tar.gz
target/tcm_fc: Fix use-after-free of ft_tpg
commit 2c42be2dd4f6586728dba5c4e197afd5cfaded78 upstream. ft_del_tpg checks tpg->tport is set before unlinking the tpg from the tport when the tpg is being removed. Set this pointer in ft_tport_create, or the unlinking won't happen in ft_del_tpg and tport->tpg will reference a deleted object. This patch sets tpg->tport in ft_tport_create, because that's what ft_del_tpg checks, and is the only way to get back to the tport to clear tport->tpg. The bug was occuring when: - lport created, tport (our per-lport, per-provider context) is allocated. tport->tpg = NULL - tpg created - a PRLI is received. ft_tport_create is called, tpg is found and tport->tpg is set - tpg removed. ft_tpg is freed in ft_del_tpg. Since tpg->tport was not set, tport->tpg is not cleared and points at freed memory - Future calls to ft_tport_create return tport via first conditional, instead of searching for new tpg by calling ft_lport_find_tpg. tport->tpg is still invalid, and will access freed memory. see https://bugzilla.redhat.com/show_bug.cgi?id=1071340 Signed-off-by: Andy Grover <agrover@redhat.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/target')
-rw-r--r--drivers/target/tcm_fc/tfc_sess.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/target/tcm_fc/tfc_sess.c b/drivers/target/tcm_fc/tfc_sess.c
index 4859505ae2ed..639fdb395fb7 100644
--- a/drivers/target/tcm_fc/tfc_sess.c
+++ b/drivers/target/tcm_fc/tfc_sess.c
@@ -68,6 +68,7 @@ static struct ft_tport *ft_tport_create(struct fc_lport *lport)
if (tport) {
tport->tpg = tpg;
+ tpg->tport = tport;
return tport;
}