core分析-间接的指针误操作

最新推荐文章于 2024-04-26 15:08:18 发布

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最新推荐文章于 2024-04-26 15:08:18 发布 · 2k 阅读

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本文通过分析一个core dump的堆栈信息，揭示了一个由指针误操作导致的STL容器析构问题。问题出现在写PNG图片时，由于对buffer的错误处理，使得指针越界修改了STL容器内容。解决此类问题的方法包括代码回滚、模块隔离以及仔细审查指针和数组下标操作。防止这类问题的关键在于谨慎进行写操作，确保边界安全。

先来看下core的堆栈信息：

(gdb) bt 20
#0 0x06d99e7c in __exchange_and_add (__mem=0xc08a69d8, __val=-1) at ...../../../../include/c++/4.6.2/ext/atomicity.h:48
#1 __exchange_and_add_dispatch (__val=-1, __mem=0xc08a69d8) at ...../../../../include/c++/4.6.2/ext/atomicity.h:81
#2 _M_dispose (__a=..., this=0xc08a69d0) at ...../../../../include/c++/4.6.2/bits/basic_string.h:240
#3 ~basic_string (this=0x99962fb8, __in_chrg=<optimized out>) at ...../../../../include/c++/4.6.2/bits/basic_string.h:534
#4 ~Property (this=0x99962fb0, __in_chrg=<optimized out>) at .../OutputElement.h:184
#5 ~_List_node (this=0x99962fa8, __in_chrg=<optimized out>) at ...../../../../include/c++/4.6.2/bits/stl_list.h:105
#6 destroy (__p=0x99962fa8, this=<optimized out>) at ...../../../../include/c++/4.6.2/ext/new_allocator.h:118
#7 _M_clear (this=0x9996