Commit de4b4b94 authored by Michael Mullin's avatar Michael Mullin Committed by Andrii Nakryiko
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bpftool: Check for NULL ptr of btf in codegen_asserts 



bpf_object__btf() can return a NULL value.  If bpf_object__btf returns
null, do not progress through codegen_asserts(). This avoids a null ptr
dereference at the call btf__type_cnt() in the function find_type_for_map()

Signed-off-by: default avatarMichael Mullin <masmullin@gmail.com>
Signed-off-by: default avatarAndrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20220523194917.igkgorco42537arb@jup
parent eb7b36ce

tools/bpf/bpftool/gen.c

+3 −0
Original line number Diff line number Diff line
@@ -474,6 +474,9 @@ static void codegen_asserts(struct bpf_object *obj, const char *obj_name) 
	const struct btf_type *sec;

	char map_ident[256], var_ident[256];



	if (!btf)

		return;



	codegen("\

		\n\

		__attribute__((unused)) static void			    \n\