diff options
| author | Moshe Lazer | 2015-02-05 12:53:52 +0100 |
|---|---|---|
| committer | Roland Dreier | 2015-02-18 07:06:42 +0100 |
| commit | 0fb8bcf022f19a375d7c4bd79ac513da8ae6d78b (patch) | |
| tree | 93ae49f2d4030a880055fd2392119fec22068dfb /drivers/infiniband/core/uverbs_cmd.c | |
| parent | IB/core: When marshaling ucma path from user-space, clear unused fields (diff) | |
| download | kernel-qcow2-linux-0fb8bcf022f19a375d7c4bd79ac513da8ae6d78b.tar.gz kernel-qcow2-linux-0fb8bcf022f19a375d7c4bd79ac513da8ae6d78b.tar.xz kernel-qcow2-linux-0fb8bcf022f19a375d7c4bd79ac513da8ae6d78b.zip | |
IB/core: Fix deadlock on uverbs modify_qp error flow
The deadlock occurs in __uverbs_modify_qp: we take a lock (idr_read_qp)
and in case of failure in ib_resolve_eth_l2_attrs we don't release
it (put_qp_read). Fix that.
Fixes: ed4c54e5b4ba ("IB/core: Resolve Ethernet L2 addresses when modifying QP")
Signed-off-by: Moshe Lazer <moshel@mellanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
Diffstat (limited to 'drivers/infiniband/core/uverbs_cmd.c')
| -rw-r--r-- | drivers/infiniband/core/uverbs_cmd.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c index b7943ff16ed3..6c52e72f8d2c 100644 --- a/drivers/infiniband/core/uverbs_cmd.c +++ b/drivers/infiniband/core/uverbs_cmd.c @@ -2091,20 +2091,21 @@ ssize_t ib_uverbs_modify_qp(struct ib_uverbs_file *file, if (qp->real_qp == qp) { ret = ib_resolve_eth_l2_attrs(qp, attr, &cmd.attr_mask); if (ret) - goto out; + goto release_qp; ret = qp->device->modify_qp(qp, attr, modify_qp_mask(qp->qp_type, cmd.attr_mask), &udata); } else { ret = ib_modify_qp(qp, attr, modify_qp_mask(qp->qp_type, cmd.attr_mask)); } - put_qp_read(qp); - if (ret) - goto out; + goto release_qp; ret = in_len; +release_qp: + put_qp_read(qp); + out: kfree(attr); |