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gnu.cfg: Add xfree() (#2051) 

It is hard to find good references, one that describes it a bit can
be found here:
https://manpages.ubuntu.com/manpages/bionic/man3/xmalloc.3pub.html

xfree() can be used instead of free().
A check, to verify that a memory leak is found if the memory allocated
via xmalloc() is not freed, has also been added.
This commit is contained in:
Sebastian 2019-08-02 07:41:32 +02:00 committed by GitHub
parent 29596baa92
commit 5390588cda
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2 changed files with 27 additions and 0 deletions
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8
cfg/gnu.cfg
View File

@ -14,6 +14,7 @@
<alloc init="true" buffer-size="strdup">xstrdup</alloc>
<realloc init="false" buffer-size="malloc:2">xrealloc</realloc>
<dealloc>free</dealloc>
<dealloc>xfree</dealloc>
</memory>
<!-- https://linux.die.net/man/3/backtrace -->
<memory>
@ -66,6 +67,13 @@
<not-bool/>
</arg>
</function>
<!-- void xfree(void *block); -->
<function name="xfree">
<returnValue type="void"/>
<arg nr="1">
<not-uninit/>
</arg>
</function>
<!-- ssize_t splice(int fd_in, loff_t *off_in, int fd_out, loff_t *off_out, size_t len, unsigned int flags); -->
<function name="splice">
<leak-ignore/>

19
test/cfg/gnu.c
View File

@ -19,6 +19,7 @@
extern void *xcalloc(size_t nmemb, size_t size);
extern void *xmalloc(size_t size);
extern void *xrealloc(void *block, size_t newsize);
extern void xfree(void *ptr);
void resourceLeak_mkostemps(char *template, int suffixlen, int flags)
{
@ -76,8 +77,19 @@ int no_resourceLeak_mkostemp_02(char *template, int flags)
void valid_code(int argInt1)
{
char *p;
if (__builtin_expect(argInt1, 0)) {}
if (__builtin_expect_with_probability(argInt1 + 1, 2, 0.5)) {}
p = (char *)malloc(10);
free(p);
p = (char *)malloc(5);
xfree(p);
p = (char *)xmalloc(10);
free(p);
p = (char *)xmalloc(5);
xfree(p);
}
void ignoreleak(void)
@ -98,6 +110,13 @@ void memleak_asprintf(char **ptr, const char *fmt, const int arg)
}
}
void memleak_xmalloc()
{
char *p = (char*)xmalloc(10);
p[9] = 0;
// cppcheck-suppress memleak
}
void uninitvar__builtin_memset(void)
{
void *s;