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90 lines
1.5 KiB
90 lines
1.5 KiB
3 years ago
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/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#import <Foundation/NSObject.h>
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@interface BlockA : NSObject
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@end
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@implementation BlockA {
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void (^_block_field)(void);
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}
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- (void)doSomethingThenCallback:(void (^)(void))my_block {
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// null dereference, segfault
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my_block();
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}
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- (void)foo {
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void (^my_block)(void) = ^() {
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};
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my_block = NULL;
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my_block(); // Null deref
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}
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- foo2:(void (^)(void))my_block {
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// ok to call this block!
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if (my_block != nil) {
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my_block();
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}
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}
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- (void)foo3:(void (^)(void))my_block {
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my_block = NULL;
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my_block(); // Null deref
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}
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- (void)foo4:(void (^)(void))my_block_param {
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void (^my_block)(void) = ^() {
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};
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my_block = NULL;
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my_block_param = my_block;
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my_block_param(); // Null deref
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}
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- (void)foo5:(void (^)(void))my_block_param {
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void (^my_block)(void) = ^() {
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};
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my_block_param = my_block;
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my_block_param(); // No error here
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}
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- (void)foo6:(BOOL)a block_param:(void (^)(void))block_param {
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void (^my_block)(void) = ^() {
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if (block_param)
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block_param(); // No error here
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};
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if (a) {
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[self foo2:^() {
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my_block(); // No error here
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}];
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}
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}
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- (void)foo7 {
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_block_field(); // Ivar not nullable
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}
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- (int)check_nullify {
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int i = 7;
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int* x = &i;
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int (^my_block)(void) = ^() {
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return *x; // we'll get a false NPE here if we nullify x too early.
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};
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return my_block();
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}
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@end
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