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CVE-2024-42151
In the Linux kernel, the following vulnerability has been resolved:
bpf: mark bpf_dummy_struct_ops.test_1 parameter as nullable
Test case dummy_st_ops/dummy_init_ret_value passes NULL as the first
parameter of the test_1() function. Mark this parameter as nullable to
make verifier aware of such possibility.
Otherwise, NULL check in the test_1() code:
SEC("struct_ops/test_1")
int BPF_PROG(test_1, struct bpf_dummy_ops_state *state)
{
if (!state)
return ...;
... access state ...
}
Might be removed by verifier, thus triggering NULL pointer dereference
under certain conditions.
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