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| CodeSonar® 9.2p0 | CONFIDENTIAL | CodeSecure Inc |
An attempt to use a file or socket that has already been closed.
| Class Name | Use After Close | |||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Significance | security | |||||||||||||||||||||||||||||||||||||||||||||
| Mnemonic | IO.UAC | |||||||||||||||||||||||||||||||||||||||||||||
| Categories |
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| Availability | Available for C and C++. |
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| Enabling | Checks for this warning class are enabled by
default. To disable them, add the following WARNING_FILTER rule to the
project configuration file.
WARNING_FILTER += discard class="Use After Close" |
Japanese (ja)
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
int uac(char *buf){
int fd;
ssize_t w;
fd = open("A.txt", O_CREAT|O_RDWR);
if (fd < 0){return -1;}
close(fd);
w = write(fd, buf, strlen(buf)); /* 'Use After Close' warning issued here */
return w;
}
CodeSonar ships with library models that allow it to recognize a large number of functions that use a file or socket identified by file/socket descriptor. Some examples are shown in the table below. If one of these functions is called with a file/socket descriptor argument associated with a file or socket that has already been closed, a warning will be issued.
If you have created a custom library model for some function f() in terms of one of these existing models, calls to f() will also be capable of triggering Use After Close warnings.
| Functions that can trigger a warning include... | |
|---|---|
| libc | dup(), fdopen(), stat() |
| Win32 | _lseek(), _read(), _write() |
The following configuration file parameters affect checks for this warning class.
To report problems with this documentation, please visit https://support.codesecure.com/.