bpf: simplify verifier register state assignments

verifier is using the following structure to track the state of registers:
struct reg_state {
    enum bpf_reg_type type;
    union {
        int imm;
        struct bpf_map *map_ptr;
    };
};
and later on in states_equal() does memcmp(&old->regs[i], &cur->regs[i],..)
to find equivalent states.
Throughout the code of verifier there are assignements to 'imm' and 'map_ptr'
fields and it's not obvious that most of the assignments into 'imm' don't
need to clear extra 4 bytes (like mark_reg_unknown_value() does) to make sure
that memcmp doesn't go over junk left from 'map_ptr' assignment.

Simplify the code by converting 'int' into 'long'
Suggested-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

kernel/bpf/verifier.c

@@ -142,7 +142,7 @@ struct reg_state {
 	enum bpf_reg_type type;
 	union {
 		/* valid when type == CONST_IMM | PTR_TO_STACK */
-		int imm;
+		long imm;
 
 		/* valid when type == CONST_PTR_TO_MAP | PTR_TO_MAP_VALUE |
 		 *   PTR_TO_MAP_VALUE_OR_NULL
@@ -263,7 +263,7 @@ static void print_verifier_state(struct verifier_env *env)
 			continue;
 		verbose(" R%d=%s", i, reg_type_str[t]);
 		if (t == CONST_IMM || t == PTR_TO_STACK)
-			verbose("%d", env->cur_state.regs[i].imm);
+			verbose("%ld", env->cur_state.regs[i].imm);
 		else if (t == CONST_PTR_TO_MAP || t == PTR_TO_MAP_VALUE ||
 			 t == PTR_TO_MAP_VALUE_OR_NULL)
 			verbose("(ks=%d,vs=%d)",
@@ -480,7 +480,6 @@ static void init_reg_state(struct reg_state *regs)
 	for (i = 0; i < MAX_BPF_REG; i++) {
 		regs[i].type = NOT_INIT;
 		regs[i].imm = 0;
-		regs[i].map_ptr = NULL;
 	}
 
 	/* frame pointer */
@@ -495,7 +494,6 @@ static void mark_reg_unknown_value(struct reg_state *regs, u32 regno)
 	BUG_ON(regno >= MAX_BPF_REG);
 	regs[regno].type = UNKNOWN_VALUE;
 	regs[regno].imm = 0;
-	regs[regno].map_ptr = NULL;
 }
 
 enum reg_arg_type {