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24 January 2017 11:16 AM

velokw Newbie

Total Posts: 1

Joined 2013-05-25

I have a .fit file that crashes the cpp version of the FIT_SDK while either using fit::Decode::Read() or fit::Decode::CheckIntegrity(). Will someone help troubleshoot and help me with a patch that will deal with the error gracefully?

I'll send the file by e-mail separately if someone will have a look. It's easy to reproduce using the command line utility in FitSDKRelease_20/cpp/examples/decodeMac. In the debugger I get an EXC_BAD_ACCESS here:

FIT_UINT8 DeveloperFieldDefinition::GetSize() const
{
    return size; 

when because this is null when called from fit_decode.cpp line 873:

case STATE_DEV_FIELD_DATA: {
             MesgDefinition& localMesgDef = localMesgDefs[localMesgIndex];
             DeveloperFieldDefinition* fieldDef = localMesgDef.GetDevFieldByIndex(fieldIndex);

             if (fieldBytesLeft == 0)
             {
                 fieldDataIndex = 0;
                 fieldBytesLeft = fieldDef->GetSize();

                 if (fieldBytesLeft == 0)
                 {
                     fieldBytesLeft = localMesgDefs->
                         GetDevFieldByIndex(++fieldIndex)->GetSize();   <---- line 873 

08 February 2017 05:46 AM #1

jstoorvo Newbie

Total Posts: 7

Joined 2017-02-08

I'm developing myself but I don't have access to a Mac station. Currently I'm using Linux/gcc.

I think it would be wise to include a backtrace. Does this happen only at a specific .fit file?
Please send it to me so I can check. I'm building a decoder myself, so it shouldn't take too much effort for me to check.

I doubt whether it's Getsize() that produces the error; the other function might return a zero pointer instead of a valid developer Field...

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FIT file crashes cpp SDK