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| author | Leon Romanovsky <leonro@mellanox.com> | 2018-03-25 11:39:05 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-04-08 14:26:28 +0200 |
| commit | 4fbf77d7a9fed2f53d0e77cd959987b977f13dec (patch) | |
| tree | 19487c8677eefbe71b79904deb808b127fe9ffd6 | |
| parent | 4dba68fd1dfefc4dfbf3f6f5fcda99c13668c671 (diff) | |
| download | linux-stable-4fbf77d7a9fed2f53d0e77cd959987b977f13dec.tar.gz linux-stable-4fbf77d7a9fed2f53d0e77cd959987b977f13dec.tar.bz2 linux-stable-4fbf77d7a9fed2f53d0e77cd959987b977f13dec.zip | |
RDMA/ucma: Check that device exists prior to accessing it
commit c8d3bcbfc5eab3f01cf373d039af725f3b488813 upstream.
Ensure that device exists prior to accessing its properties.
Reported-by: <syzbot+71655d44855ac3e76366@syzkaller.appspotmail.com>
Fixes: 75216638572f ("RDMA/cma: Export rdma cm interface to userspace")
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/infiniband/core/ucma.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/infiniband/core/ucma.c b/drivers/infiniband/core/ucma.c index 87f5f35e0793..6cd51274ba21 100644 --- a/drivers/infiniband/core/ucma.c +++ b/drivers/infiniband/core/ucma.c @@ -1335,7 +1335,7 @@ static ssize_t ucma_notify(struct ucma_file *file, const char __user *inbuf, { struct rdma_ucm_notify cmd; struct ucma_context *ctx; - int ret; + int ret = -EINVAL; if (copy_from_user(&cmd, inbuf, sizeof(cmd))) return -EFAULT; @@ -1344,7 +1344,9 @@ static ssize_t ucma_notify(struct ucma_file *file, const char __user *inbuf, if (IS_ERR(ctx)) return PTR_ERR(ctx); - ret = rdma_notify(ctx->cm_id, (enum ib_event_type) cmd.event); + if (ctx->cm_id->device) + ret = rdma_notify(ctx->cm_id, (enum ib_event_type)cmd.event); + ucma_put_ctx(ctx); return ret; } |