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Buffer overrun : Use variable id if available in check of memset etc

This commit is contained in:
Daniel Marjamäki 2008-12-13 08:49:13 +00:00
parent 5ea8d411b5
commit e99744ae9b
2 changed files with 35 additions and 3 deletions
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20
CheckBufferOverrun.cpp
View File

@ -133,8 +133,24 @@ void CheckBufferOverrunClass::CheckBufferOverrun_CheckScope( const TOKEN *tok, c
}
// memset, memcmp, memcpy, strncpy, fgets..
if (TOKEN::Match(tok,"memset|memcpy|memmove|memcmp|strncpy|fgets") )
// memset, memcmp, memcpy, strncpy, fgets..
if ( varid > 0 )
{
if ( TOKEN::Match(tok, "memset|memcpy|memmove|memcmp|strncpy|fgets") )
{
if ( TOKEN::Match( tok->next(), "( %varid% , %num% , %num% )", 0, 0, varid ) ||
TOKEN::Match( tok->next(), "( %var% , %varid% , %num% )", 0, 0, varid ) )
{
const char *num = tok->strAt(6);
if ( atoi(num) > total_size )
{
ReportError(tok, "Buffer overrun");
}
}
continue;
}
}
else if (TOKEN::Match(tok,"memset|memcpy|memmove|memcmp|strncpy|fgets") )
{
if ( TOKEN::Match( tok->next(), "( %var1% , %num% , %num% )", varname ) ||
TOKEN::Match( tok->next(), "( %var% , %var1% , %num% )", varname ) )

18
testbufferoverrun.cpp
View File

@ -83,7 +83,8 @@ private:
TEST_CASE( buffer_overrun_1 );
TEST_CASE( buffer_overrun_2 );
TEST_CASE( varid1 );
TEST_CASE( varid1 );
TEST_CASE( varid2 );
}
@ -373,6 +374,21 @@ private:
ASSERT_EQUALS( std::string(""), errout.str() );
}
void varid2()
{
check( "void foo()\n"
"{\n"
" char str[10];\n"
" if (str[0])\n"
" {\n"
" char str[50];\n"
" memset(str,0,50);\n"
" }\n"
"}\n" );
ASSERT_EQUALS( std::string(""), errout.str() );
}
};