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authorErez Shitrit <erezsh@mellanox.com>2016-08-28 10:58:30 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-10-07 15:23:46 +0200
commit23bd03de926aacbea149e3bab29f05132885177c (patch)
tree71e815a691c1792bb9673d696355f9e83c702b78
parent79b993c132a79a4eaf8a1d3489b8cced7b5adad8 (diff)
IB/core: Fix use after free in send_leave function
commit 68c6bcdd8bd00394c234b915ab9b97c74104130c upstream. The function send_leave sets the member: group->query_id (group->query_id = ret) after calling the sa_query, but leave_handler can be executed before the setting and it might delete the group object, and will get a memory corruption. Additionally, this patch gets rid of group->query_id variable which is not used. Fixes: faec2f7b96b5 ('IB/sa: Track multicast join/leave requests') Signed-off-by: Erez Shitrit <erezsh@mellanox.com> Signed-off-by: Leon Romanovsky <leon@kernel.org> Signed-off-by: Doug Ledford <dledford@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/infiniband/core/multicast.c13
1 files changed, 2 insertions, 11 deletions
diff --git a/drivers/infiniband/core/multicast.c b/drivers/infiniband/core/multicast.c
index bb6685fb08c6..6aa648cb5381 100644
--- a/drivers/infiniband/core/multicast.c
+++ b/drivers/infiniband/core/multicast.c
@@ -106,7 +106,6 @@ struct mcast_group {
atomic_t refcount;
enum mcast_group_state state;
struct ib_sa_query *query;
- int query_id;
u16 pkey_index;
u8 leave_state;
int retries;
@@ -339,11 +338,7 @@ static int send_join(struct mcast_group *group, struct mcast_member *member)
member->multicast.comp_mask,
3000, GFP_KERNEL, join_handler, group,
&group->query);
- if (ret >= 0) {
- group->query_id = ret;
- ret = 0;
- }
- return ret;
+ return (ret > 0) ? 0 : ret;
}
static int send_leave(struct mcast_group *group, u8 leave_state)
@@ -363,11 +358,7 @@ static int send_leave(struct mcast_group *group, u8 leave_state)
IB_SA_MCMEMBER_REC_JOIN_STATE,
3000, GFP_KERNEL, leave_handler,
group, &group->query);
- if (ret >= 0) {
- group->query_id = ret;
- ret = 0;
- }
- return ret;
+ return (ret > 0) ? 0 : ret;
}
static void join_group(struct mcast_group *group, struct mcast_member *member,