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Partial fix for #14833 FN returnDanglingLifetime with memcpy() #8647

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Merged
chrchr-github merged 4 commits into from
Jun 12, 2026
+29 −17
Merged

Partial fix for #14833 FN returnDanglingLifetime with memcpy() #8647

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088ac1f
Update std.cfg
chrchr-github Jun 12, 2026
9c985b3
Update std.cpp
chrchr-github Jun 12, 2026
9b7f3c4
Update std.cpp [skip ci]
chrchr-github Jun 12, 2026
953836d
Update std.cfg
chrchr-github Jun 12, 2026
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28 changes: 14 additions & 14 deletions cfg/std.cfg
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Original file line number Diff line number Diff line change
Expand Up @@ -3989,7 +3989,7 @@ The obsolete function 'gets' is called. With 'gets' you'll get a buffer overrun
</function>
<!-- void * memcpy(void *ct, const void *cs, size_t n);-->
<function name="memcpy,std::memcpy">
<returnValue type="void *"/>
<returnValue type="void *">arg1</returnValue>
<noreturn>false</noreturn>
<leak-ignore/>
<not-overlapping-data ptr1-arg="1" ptr2-arg="2" size-arg="3"/>
Expand All @@ -4010,7 +4010,7 @@ The obsolete function 'gets' is called. With 'gets' you'll get a buffer overrun
</function>
<!-- wchar_t* wmemcpy( wchar_t* dest, const wchar_t* src, std::size_t count ); -->
<function name="wmemcpy,std::wmemcpy">
<returnValue type="wchar_t *"/>
<returnValue type="wchar_t *">arg1</returnValue>
<noreturn>false</noreturn>
<leak-ignore/>
<not-overlapping-data ptr1-arg="1" ptr2-arg="2" count-arg="3"/>
Expand Down Expand Up @@ -4056,7 +4056,7 @@ The obsolete function 'gets' is called. With 'gets' you'll get a buffer overrun
<!-- void * memmove(void *ct, const void *cs, size_t n); -->
<function name="memmove,std::memmove">
<noreturn>false</noreturn>
<returnValue type="void *"/>
<returnValue type="void *">arg1</returnValue>
<leak-ignore/>
<arg nr="1" direction="out">
<not-null/>
Expand All @@ -4077,7 +4077,7 @@ The obsolete function 'gets' is called. With 'gets' you'll get a buffer overrun
<!-- wchar_t * wmemmove(wchar_t *ct, const wchar_t *cs, size_t n); -->
<function name="wmemmove,std::wmemmove">
<noreturn>false</noreturn>
<returnValue type="wchar_t *"/>
<returnValue type="wchar_t *">arg1</returnValue>
<leak-ignore/>
<arg nr="1" direction="out">
<not-null/>
Expand Down Expand Up @@ -4118,7 +4118,7 @@ The obsolete function 'gets' is called. With 'gets' you'll get a buffer overrun
</function>
<!-- void *memset(void *s, int c, size_t n); -->
<function name="memset,std::memset">
<returnValue type="void *"/>
<returnValue type="void *">arg1</returnValue>
<noreturn>false</noreturn>
<leak-ignore/>
<arg nr="1" direction="out" indirect="1">
Expand All @@ -4136,7 +4136,7 @@ The obsolete function 'gets' is called. With 'gets' you'll get a buffer overrun
</function>
<!-- wchar_t *wmemset(wchar_t *s, wchar_t c, size_t n); -->
<function name="wmemset,std::wmemset">
<returnValue type="wchar_t *"/>
<returnValue type="wchar_t *">arg1</returnValue>
<noreturn>false</noreturn>
<leak-ignore/>
<arg nr="1" direction="out">
Expand Down Expand Up @@ -4812,7 +4812,7 @@ The obsolete function 'gets' is called. With 'gets' you'll get a buffer overrun
</function>
<!-- char * strcat(char *deststr, const char *srcstr); -->
<function name="strcat,std::strcat">
<returnValue type="char *"/>
<returnValue type="char *">arg1</returnValue>
<noreturn>false</noreturn>
<leak-ignore/>
<not-overlapping-data ptr1-arg="1" ptr2-arg="2" strlen-arg="2"/>
Expand All @@ -4828,9 +4828,9 @@ The obsolete function 'gets' is called. With 'gets' you'll get a buffer overrun
<strz/>
</arg>
</function>
<!-- wchar_t wcscat(wchar_t *deststr, const wchar_t *srcstr); -->
<!-- wchar_t* wcscat(wchar_t *deststr, const wchar_t *srcstr); -->
<function name="wcscat,std::wcscat">
<returnValue type="wchar_t"/>
<returnValue type="wchar_t *">arg1</returnValue>
<noreturn>false</noreturn>
<leak-ignore/>
<not-overlapping-data ptr1-arg="1" ptr2-arg="2" strlen-arg="2"/>
Expand Down Expand Up @@ -4942,7 +4942,7 @@ The obsolete function 'gets' is called. With 'gets' you'll get a buffer overrun
</function>
<!-- wchar_t *wcscpy(wchar_t *deststr, const wchar_t *srcstr); -->
<function name="wcscpy,std::wcscpy">
<returnValue type="wchar_t *"/>
<returnValue type="wchar_t *">arg1</returnValue>
<noreturn>false</noreturn>
<leak-ignore/>
<not-overlapping-data ptr1-arg="1" ptr2-arg="2" strlen-arg="2"/>
Expand Down Expand Up @@ -5057,7 +5057,7 @@ The obsolete function 'gets' is called. With 'gets' you'll get a buffer overrun
</function>
<!-- char * strncat(char *ct, const char *s, size_t n); -->
<function name="strncat,std::strncat">
<returnValue type="char *"/>
<returnValue type="char *">arg1</returnValue>
<noreturn>false</noreturn>
<leak-ignore/>
<not-overlapping-data ptr1-arg="1" ptr2-arg="2" size-arg="3"/>
Expand Down Expand Up @@ -5123,10 +5123,10 @@ The obsolete function 'gets' is called. With 'gets' you'll get a buffer overrun
<not-uninit/>
</arg>
</function>
<!-- wchar_t *wcsncat(wchar_t *ct, const wchar_t *cs, size_t n); -->
<!-- wchar_t* *wcsncat(wchar_t *ct, const wchar_t *cs, size_t n); -->
<function name="wcsncat,std::wcsncat">
<noreturn>false</noreturn>
<returnValue type="wchar_t *"/>
<returnValue type="wchar_t *">arg1</returnValue>
<leak-ignore/>
<not-overlapping-data ptr1-arg="1" ptr2-arg="2" count-arg="3"/>
<arg nr="1" direction="inout">
Expand Down Expand Up @@ -5373,7 +5373,7 @@ The obsolete function 'gets' is called. With 'gets' you'll get a buffer overrun
</function>
<!-- wchar_t * wcsncpy(wchar_t *s, const wchar_t *cs, size_t n); -->
<function name="wcsncpy,std::wcsncpy">
<returnValue type="wchar_t *"/>
<returnValue type="wchar_t *">arg1</returnValue>
<noreturn>false</noreturn>
<leak-ignore/>
<not-overlapping-data ptr1-arg="1" ptr2-arg="2" count-arg="3"/>
Expand Down
18 changes: 15 additions & 3 deletions test/cfg/std.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -869,7 +869,7 @@ char * overlappingWriteFunction_strncat(const char *src, char *dest, const std::
// cppcheck-suppress overlappingWriteFunction
(void)strncat(dest, dest+1, 2);
char buffer[] = "strncat";
// cppcheck-suppress overlappingWriteFunction
// cppcheck-suppress [overlappingWriteFunction,returnDanglingLifetime]
return strncat(buffer, buffer + 1, 3);
}

Expand All @@ -882,7 +882,7 @@ wchar_t * overlappingWriteFunction_wcsncat(const wchar_t *src, wchar_t *dest, co
// cppcheck-suppress overlappingWriteFunction
(void)wcsncat(dest, dest+1, 2);
wchar_t buffer[] = L"strncat";
// cppcheck-suppress overlappingWriteFunction
// cppcheck-suppress [overlappingWriteFunction,returnDanglingLifetime]
return wcsncat(buffer, buffer + 1, 3);
}

Expand Down Expand Up @@ -917,8 +917,8 @@ char * overlappingWriteFunction_strncpy(char *buf, const std::size_t count)

void * overlappingWriteFunction_memmove(void)
{
// No warning shall be shown:
char str[] = "memmove handles overlapping data well";
// cppcheck-suppress returnDanglingLifetime
return memmove(str,str+3,4);
}

Expand Down Expand Up @@ -4982,6 +4982,18 @@ std::span<const int> returnDanglingLifetime_std_span1() {
}
#endif

void* returnDanglingLifetime_memcpy() { // #14833
char a[4];
// cppcheck-suppress returnDanglingLifetime
return memcpy(a, "abc", 4);
}

wchar_t* returnDanglingLifetime_wcscat() {
wchar_t a[10]{L"abc"};
// cppcheck-suppress returnDanglingLifetime
return wcscat(a, L"def");
}

void beginEnd()
{
std::vector<int> v;
Expand Down
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