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| CodeSonar® 9.0p0 Hot Tips | CONFIDENTIAL | CodeSecure Inc |
Two attempts to free the same dynamic object.
| Class Name | Double Free | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Significance | security | ||||||||||||||||||||||||||||||
| Mnemonic | ALLOC.DF | ||||||||||||||||||||||||||||||
| 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="Double Free" |
Double Free warnings can be triggered by any function treated as a deallocator by CodeSonar:
Japanese (ja)
#include <stdlib.h>
void double_free(void){
char *p = malloc(10);
if (!p){
return;
}
char *q = p; /* aliasing is taken into account */
free(p);
free(q); /* 'Double Free' warning issued here */
}
The following configuration file parameters affect checks for this warning class.