libbpf: Ensure umem pointer is non-NULL before dereferencing
Calls to xsk_socket__create dereference the umem to access the fill_save and comp_save pointers. Make sure the umem is non-NULL before doing this. Fixes: 2f6324a3 ("libbpf: Support shared umems between queues and devices") Signed-off-by:Ciara Loftus <ciara.loftus@intel.com> Signed-off-by:
Alexei Starovoitov <ast@kernel.org> Acked-by:
Magnus Karlsson <magnus.karlsson@intel.com> Link: https://lore.kernel.org/bpf/20210331061218.1647-2-ciara.loftus@intel.com
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