2.0 hotfix: Resolve intermittent crash due to zero-byte reads in log reading #1501
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henryzhx8
reviewed
May 22, 2024
| @@ -2087,7 +2090,7 @@ LogFileReader::RemoveLastIncompleteLog(char* buffer, int32_t size, int32_t& roll | |||
| */ | |||
| StringView LogFileReader::GetLastLine(StringView buffer, size_t end) { | |||
| if (end == 0) { | |||
| return buffer; | |||
| return StringView(buffer.data(), 0); | |||
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外层函数要处理吗？boost遇到size=0是什么行为？
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补了一个单测，boost的结果是一个空字符串。GetLastLine的返回结果只会用到开始的位置，只要是以buffer.data()开头的，应该没有问题。
messixukejia
approved these changes
May 23, 2024
yyuuttaaoo
approved these changes
May 23, 2024
yyuuttaaoo
changed the title
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问题
超时导致force read后，如果下一次读取是以\n开头的，那么这个\n应该被忽略掉。
但是当只读取了一个\n时，这个回退操作会导致读取的长度nbytes变为0，触发内存越界。