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RDMA/ucma: Fix use-after-free access in ucma_close 

The error in ucma_create_id() left ctx in the list of contexts belong
to ucma file descriptor. The attempt to close this file descriptor causes
to use-after-free accesses while iterating over such list.

Fixes: 7521663857 ("RDMA/cma: Export rdma cm interface to userspace")
Reported-by: <syzbot+dcfd344365a56fbebd0f@syzkaller.appspotmail.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Reviewed-by: Sean Hefty <sean.hefty@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Leon Romanovsky 2018-03-19 14:20:15 +02:00 committed by Jason Gunthorpe
parent 2975d5de64
commit ed65a4dc22
1 changed files with 3 additions and 0 deletions
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3
drivers/infiniband/core/ucma.c
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@ -497,6 +497,9 @@ err1:
mutex_lock(&mut);
idr_remove(&ctx_idr, ctx->id);
mutex_unlock(&mut);
mutex_lock(&file->mut);
list_del(&ctx->list);
mutex_unlock(&file->mut);
kfree(ctx);
return ret;
}