From: Leon Romanovsky leonro@mellanox.com
[ Upstream commit a5cc9831af05e658543593abaee45a29d061bac4 ]
Number of specs is provided by user and in valid case can be equal to zero. Such argument causes to call to kcalloc() with zero-length request and in return the ZERO_SIZE_PTR is assigned. This pointer is different from NULL and makes various if (..) checks to success.
Fixes: b6ba4a9aa59f ("IB/uverbs: Add support for flow counters") Signed-off-by: Leon Romanovsky leonro@mellanox.com Signed-off-by: Jason Gunthorpe jgg@mellanox.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com --- drivers/infiniband/core/uverbs_cmd.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c index 583d3a10b940..0e5eb0f547d3 100644 --- a/drivers/infiniband/core/uverbs_cmd.c +++ b/drivers/infiniband/core/uverbs_cmd.c @@ -2812,6 +2812,9 @@ static struct ib_uflow_resources *flow_resources_alloc(size_t num_specs) if (!resources) goto err_res;
+ if (!num_specs) + goto out; + resources->counters = kcalloc(num_specs, sizeof(*resources->counters), GFP_KERNEL);
@@ -2824,8 +2827,8 @@ static struct ib_uflow_resources *flow_resources_alloc(size_t num_specs) if (!resources->collection) goto err_collection;
+out: resources->max = num_specs; - return resources;
err_collection: