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  1. JDK
  2. JDK-8283059

Uninitialized warning in check_code.c with GCC 11.2

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    • b15
    • linux

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        src/java.base/share/native/libverify/check_code.c: In function 'read_all_code':
        src/java.base/share/native/libverify/check_code.c:942:5: error: 'lengths' may be used uninitialized [-Werror=maybe-uninitialized]
          942 | check_and_push(context, lengths, VM_MALLOC_BLK);
              | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
        src/java.base/share/native/libverify/check_code.c:4145:13: note: by argument 2 of type 'const void *' to 'check_and_push' declared here
         4145 | static void check_and_push(context_type *context, const void *ptr, int kind)
              | ^~~~~~~~~~~~~~


        Because the second argument of check_and_push is "const void*" GCC assumes that the malloc:ed data, which has not yet been initialized, will not be/can not be modified later which in turn suggests it may be used without ever being initialized.

        The same general issue was addressed in JDK-8266168, presumably for GCC 11.1.

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            backported by

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8294674 Uninitialized warning in check_code.c with GCC 11.2

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8294707 Uninitialized warning in check_code.c with GCC 11.2

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8294708 Uninitialized warning in check_code.c with GCC 11.2

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8302919 Uninitialized warning in check_code.c with GCC 11.2

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved
            blocks

            Enhancement - null JDK-8283057 Update GCC to version 11.2.0 for Oracle builds on Linux

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved
            relates to

            Sub-task - The sub-task of the issue JDK-8266168 -Wmaybe-uninitialized happens in check_code.c

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved
            links to

            Commit Commit openjdk/jdk13u-dev/d4280f18

            Commit Commit openjdk/jdk15u-dev/ca5adc33

            Commit Commit openjdk/jdk17u-dev/beb2ca22

            Commit Commit openjdk/jdk/d8893fad

            Review Review openjdk/jdk13u-dev/414

            Review Review openjdk/jdk15u-dev/285

            Review Review openjdk/jdk17u-dev/724

            Review Review openjdk/jdk/7794

            Review Review openjdk/jdk/7859

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                mikael Mikael Vidstedt
                mikael Mikael Vidstedt
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