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RDMA/uverbs: check for allocation failure in uapi_add_elm() 

If the kzalloc() fails then we should return ERR_PTR(-ENOMEM).  In the
current code it's possible that the kzalloc() fails and the
radix_tree_insert() inserts the NULL pointer successfully and we return
the NULL "elm" pointer to the caller.  That results in a NULL pointer
dereference.

Fixes: 9ed3e5f447 ("IB/uverbs: Build the specs into a radix tree at runtime")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Dan Carpenter 2019-05-30 11:20:24 +03:00 committed by Jason Gunthorpe
parent 6fe1a9b9b6
commit cac2a301c0
1 changed files with 2 additions and 0 deletions
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2
drivers/infiniband/core/uverbs_uapi.c
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@ -22,6 +22,8 @@ static void *uapi_add_elm(struct uverbs_api *uapi, u32 key, size_t alloc_size)
return ERR_PTR(-EOVERFLOW); return ERR_PTR(-EOVERFLOW);
elm = kzalloc(alloc_size, GFP_KERNEL); elm = kzalloc(alloc_size, GFP_KERNEL);
if (!elm)
return ERR_PTR(-ENOMEM);
rc = radix_tree_insert(&uapi->radix, key, elm); rc = radix_tree_insert(&uapi->radix, key, elm);
if (rc) { if (rc) {
kfree(elm); kfree(elm);