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Fix #12489 FN bufferAccessOutOfBounds with overlong strcat() parameter (regression) #7268

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merged 5 commits into from
Jan 28, 2025
Merged

Fix #12489 FN bufferAccessOutOfBounds with overlong strcat() parameter (regression) #7268

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16b7de0
Update std.cfg
chrchr-github Jan 28, 2025
4399ab5
Update testbufferoverrun.cpp
chrchr-github Jan 28, 2025
a505e4a
Update testbufferoverrun.cpp
chrchr-github Jan 28, 2025
2189ff3
Update std.c
chrchr-github Jan 28, 2025
7dd35e2
Update testbufferoverrun.cpp
chrchr-github Jan 28, 2025
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1 change: 1 addition & 0 deletions cfg/std.cfg
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Original file line number Diff line number Diff line change
Expand Up @@ -4820,6 +4820,7 @@ The obsolete function 'gets' is called. With 'gets' you'll get a buffer overrun
<not-null/>
<not-uninit/>
<strz/>
<minsize type="strlen" arg="2"/>
</arg>
<arg nr="2" direction="in">
<not-null/>
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2 changes: 1 addition & 1 deletion test/cfg/std.c
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Expand Up @@ -3446,7 +3446,7 @@ void bufferAccessOutOfBounds_strcat(char *dest, const char * const source)
char buf4[4] = {0};
const char * const srcstr3 = "123";
const char * const srcstr4 = "1234";
// @todo #8599 cppcheck-suppress bufferAccessOutOfBounds
// cppcheck-suppress bufferAccessOutOfBounds
(void)strcat(buf4,srcstr4); // off by one issue: strcat is appends \0' at the end

// no warning shall be shown for
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14 changes: 14 additions & 0 deletions test/testbufferoverrun.cpp
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Expand Up @@ -3151,6 +3151,20 @@ class TestBufferOverrun : public TestFixture {
" strcat(n, \"def\");\n"
"}");
TODO_ASSERT_EQUALS("[test.cpp:5]: (error) Buffer is accessed out of bounds: n\n", "", errout_str());

check("void f()\n" // #12489
"{\n"
" char d[3] = {};\n"
" strcat(d, \"12345678\");\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Buffer is accessed out of bounds: d\n", errout_str());

check("void f()\n"
"{\n"
" char d[3] = \"ab\"; \n"
" strcat(d, \"c\");\n"
"}");
TODO_ASSERT_EQUALS("[test.cpp:4]: (error) Buffer is accessed out of bounds: d\n", "", errout_str());
}

void buffer_overrun_7() {
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