From: Dan Carpenter dan.carpenter@oracle.com
[ Upstream commit cac2a301c02a9b178842e22df34217da7854e588 ]
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: 9ed3e5f44772 ("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 Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/infiniband/core/uverbs_uapi.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/infiniband/core/uverbs_uapi.c b/drivers/infiniband/core/uverbs_uapi.c index be854628a7c63..959a3418a192d 100644 --- a/drivers/infiniband/core/uverbs_uapi.c +++ b/drivers/infiniband/core/uverbs_uapi.c @@ -17,6 +17,8 @@ static void *uapi_add_elm(struct uverbs_api *uapi, u32 key, size_t alloc_size) return ERR_PTR(-EOVERFLOW);
elm = kzalloc(alloc_size, GFP_KERNEL); + if (!elm) + return ERR_PTR(-ENOMEM); rc = radix_tree_insert(&uapi->radix, key, elm); if (rc) { kfree(elm);