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RDMA/ucma: Don't allow setting RDMA_OPTION_IB_PATH without an RDMA device

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commit 8435168d50 upstream.

Check to make sure that ctx->cm_id->device is set before we use it.
Otherwise userspace can trigger a NULL dereference by doing
RDMA_USER_CM_CMD_SET_OPTION on an ID that is not bound to a device.

Cc: <stable@vger.kernel.org>
Reported-by: <syzbot+a67bc93e14682d92fc2f@syzkaller.appspotmail.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Roland Dreier
2018-04-03 15:33:01 -07:00
committed by Greg Kroah-Hartman
parent 002c9842c8
commit dad3d955fb
1 changed files with 3 additions and 0 deletions
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3
drivers/infiniband/core/ucma.c
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@@ -1241,6 +1241,9 @@ static int ucma_set_ib_path(struct ucma_context *ctx,
if (!optlen)
return -EINVAL;
if (!ctx->cm_id->device)
return -EINVAL;
memset(&sa_path, 0, sizeof(sa_path));
sa_path.rec_type = SA_PATH_REC_TYPE_IB;