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authorRoland Dreier <roland@purestorage.com>2018-04-19 08:28:11 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-05-09 09:51:52 +0200
commit3ae1bf3681352fc8c08cbd3be2d210f59d4cc42a (patch)
treee3638120f21422b1bd8d2d0631cc4c114241a48d
parent38a65e7535031abbf796e2c645431bf7998d4084 (diff)
RDMA/ucma: Allow resolving address w/o specifying source address
commit 09abfe7b5b2f442a85f4c4d59ecf582ad76088d7 upstream. The RDMA CM will select a source device and address by consulting the routing table if no source address is passed into rdma_resolve_address(). Userspace will ask for this by passing an all-zero source address in the RESOLVE_IP command. Unfortunately the new check for non-zero address size rejects this with EINVAL, which breaks valid userspace applications. Fix this by explicitly allowing a zero address family for the source. Fixes: 2975d5de6428 ("RDMA/ucma: Check AF family prior resolving address") Cc: <stable@vger.kernel.org> Signed-off-by: Roland Dreier <roland@purestorage.com> Signed-off-by: Doug Ledford <dledford@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/infiniband/core/ucma.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/infiniband/core/ucma.c b/drivers/infiniband/core/ucma.c
index 0698d92e2656..c65f0e8ecbd6 100644
--- a/drivers/infiniband/core/ucma.c
+++ b/drivers/infiniband/core/ucma.c
@@ -678,7 +678,7 @@ static ssize_t ucma_resolve_ip(struct ucma_file *file,
if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
return -EFAULT;
- if (!rdma_addr_size_in6(&cmd.src_addr) ||
+ if ((cmd.src_addr.sin6_family && !rdma_addr_size_in6(&cmd.src_addr)) ||
!rdma_addr_size_in6(&cmd.dst_addr))
return -EINVAL;