Alex Mantaut created AXIS2C-1611:
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Summary: Seg fault if error on building conf
Key: AXIS2C-1611
URL: https://issues.apache.org/jira/browse/AXIS2C-1611
Project: Axis2-C
Issue Type: Bug
Components: core/engine
Affects Versions: 1.6.0
Environment: Linux
Reporter: Alex Mantaut
Fix For: 1.7.0
There is a segfault when an error ocurrs in creating conf.
To reproduce the bug:
- Install axis2c trunk, and compile samples
- go to AXIS2C_HOME/lib and remove or move one of the libraries (cd
$AXIS2C_HOME/lib &&sudo mv libaxis2_http_receiver.so.0.7.0
libaxis2_http_receiver.so.0.7.0.1)
- execute one of the samples (i.e. echo) it will segfault.
Altough it is an error not beeing able to find an so, it should close
gracefully, I think that this segfault may arise under other circumstances
which cause conf building to fail...
Examining the issue with valgrind it seems that there is a double freeing of
dep_engine.
dep_engine has a reference to conf and conf has a reference to dep_engine, and
when it fails on creating conf, it deletes the conf (dep_engine.c:968) and when
it exits the function tries to delete dep_engine again, which causes the
segfault.
The proposed solution is to set the dep_engine ptr from conf to NULL before
deleting the conf.
The proposed patch avoids the segfault, and doesn't leak memory in normal or
error cases, please let me know if it is OK.
Also I attach the valgrind analysis for the segfault (version prior applying
the patch)
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