bpf: Fix an error code in check_btf_func()

This code returns success if the "info_aux" allocation fails but it
should return -ENOMEM.

Fixes: 8c1b6e6 ("bpf: Compare BTF types of functions arguments with actual types")
Signed-off-by: Dan Carpenter <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
Acked-by: Song Liu <[email protected]>
Link: https://lore.kernel.org/bpf/20200604085436.GA943001@mwanda

Author: Dan Carpenter

kernel/bpf/verifier.c

@@ -7552,7 +7552,7 @@ static int check_btf_func(struct bpf_verifier_env *env,
 	const struct btf *btf;
 	void __user *urecord;
 	u32 prev_offset = 0;
-	int ret = 0;
+	int ret = -ENOMEM;
 
 	nfuncs = attr->func_info_cnt;
 	if (!nfuncs)