Type:
Priority:
Resolution:
Fixed
Affects Version/s:
2.0.0
Fix Version/s:
None
Component/s:
None
Environment:
Ubuntu 12.04LTS and others
In my application I'm getting a crash, valgrind shows this:
==4801== Memcheck, a memory error detector
==4801== Copyright (C) 2002-2011, and GNU GPL'd, by Julian Seward et al.
==4801== Using Valgrind-3.7.0 and LibVEX; rerun with -h for copyright info
==4801== Command: ./CONC-92
==4801==
==4801== Invalid write of size 1
==4801== at 0x4E4CABF: mthd_my_read_rows (in /usr/local/mariadbr134/lib/mariadb/libmariadb.so.2)
==4801== by 0x4E4C59D: mthd_my_read_query_result (in /usr/local/mariadbr134/lib/mariadb/libmariadb.so.2)
==4801== by 0x4E5F812: mysql_stmt_execute (in /usr/local/mariadbr134/lib/mariadb/libmariadb.so.2)
==4801== by 0x401599: myexecute (CONC-92.c:283)
==4801== by 0x401F5D: main (CONC-92.c:432)
==4801== Address 0x63d7d38 is 0 bytes after a block of size 8,152 alloc'd
==4801== at 0x4C2B6CD: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==4801== by 0x4E54481: my_malloc (in /usr/local/mariadbr134/lib/mariadb/libmariadb.so.2)
==4801== by 0x4E52728: alloc_root (in /usr/local/mariadbr134/lib/mariadb/libmariadb.so.2)
==4801== by 0x4E4C88F: mthd_my_read_rows (in /usr/local/mariadbr134/lib/mariadb/libmariadb.so.2)
==4801== by 0x4E4C59D: mthd_my_read_query_result (in /usr/local/mariadbr134/lib/mariadb/libmariadb.so.2)
==4801== by 0x4E5F812: mysql_stmt_execute (in /usr/local/mariadbr134/lib/mariadb/libmariadb.so.2)
==4801== by 0x401599: myexecute (CONC-92.c:283)
==4801== by 0x401F5D: main (CONC-92.c:432)
==4801==
==4801== Invalid read of size 1
==4801== at 0x4C2BFA2: strlen (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==4801== by 0x4E52895: strdup_root (in /usr/local/mariadbr134/lib/mariadb/libmariadb.so.2)
==4801== by 0x4E4B91F: unpack_fields (in /usr/local/mariadbr134/lib/mariadb/libmariadb.so.2)
==4801== by 0x4E4C5C2: mthd_my_read_query_result (in /usr/local/mariadbr134/lib/mariadb/libmariadb.so.2)
==4801== by 0x4E5F812: mysql_stmt_execute (in /usr/local/mariadbr134/lib/mariadb/libmariadb.so.2)
==4801== by 0x401599: myexecute (CONC-92.c:283)
==4801== by 0x401F5D: main (CONC-92.c:432)
==4801== Address 0x63d7d38 is 0 bytes after a block of size 8,152 alloc'd
==4801== at 0x4C2B6CD: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==4801== by 0x4E54481: my_malloc (in /usr/local/mariadbr134/lib/mariadb/libmariadb.so.2)
==4801== by 0x4E52728: alloc_root (in /usr/local/mariadbr134/lib/mariadb/libmariadb.so.2)
==4801== by 0x4E4C88F: mthd_my_read_rows (in /usr/local/mariadbr134/lib/mariadb/libmariadb.so.2)
==4801== by 0x4E4C59D: mthd_my_read_query_result (in /usr/local/mariadbr134/lib/mariadb/libmariadb.so.2)
==4801== by 0x4E5F812: mysql_stmt_execute (in /usr/local/mariadbr134/lib/mariadb/libmariadb.so.2)
==4801== by 0x401599: myexecute (CONC-92.c:283)
==4801== by 0x401F5D: main (CONC-92.c:432)
==4801==
==4801== Invalid read of size 1
==4801== at 0x4C2D0E1: memcpy@@GLIBC_2.14 (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==4801== by 0x4E528BD: strdup_root (in /usr/local/mariadbr134/lib/mariadb/libmariadb.so.2)
==4801== by 0x4E4B91F: unpack_fields (in /usr/local/mariadbr134/lib/mariadb/libmariadb.so.2)
==4801== by 0x4E4C5C2: mthd_my_read_query_result (in /usr/local/mariadbr134/lib/mariadb/libmariadb.so.2)
==4801== by 0x4E5F812: mysql_stmt_execute (in /usr/local/mariadbr134/lib/mariadb/libmariadb.so.2)
==4801== by 0x401599: myexecute (CONC-92.c:283)
==4801== by 0x401F5D: main (CONC-92.c:432)
==4801== Address 0x63d7d38 is 0 bytes after a block of size 8,152 alloc'd
==4801== at 0x4C2B6CD: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==4801== by 0x4E54481: my_malloc (in /usr/local/mariadbr134/lib/mariadb/libmariadb.so.2)
==4801== by 0x4E52728: alloc_root (in /usr/local/mariadbr134/lib/mariadb/libmariadb.so.2)
==4801== by 0x4E4C88F: mthd_my_read_rows (in /usr/local/mariadbr134/lib/mariadb/libmariadb.so.2)
==4801== by 0x4E4C59D: mthd_my_read_query_result (in /usr/local/mariadbr134/lib/mariadb/libmariadb.so.2)
==4801== by 0x4E5F812: mysql_stmt_execute (in /usr/local/mariadbr134/lib/mariadb/libmariadb.so.2)
==4801== by 0x401599: myexecute (CONC-92.c:283)
==4801== by 0x401F5D: main (CONC-92.c:432)
==4801==
SUCCESS!
==4801==
==4801== HEAP SUMMARY:
==4801== in use at exit: 296 bytes in 2 blocks
==4801== total heap usage: 239 allocs, 237 frees, 167,116 bytes allocated
==4801==
==4801== LEAK SUMMARY:
==4801== definitely lost: 0 bytes in 0 blocks
==4801== indirectly lost: 0 bytes in 0 blocks
==4801== possibly lost: 0 bytes in 0 blocks
==4801== still reachable: 296 bytes in 2 blocks
==4801== suppressed: 0 bytes in 0 blocks
==4801== Rerun with --leak-check=full to see details of leaked memory
==4801==
==4801== For counts of detected and suppressed errors, rerun with: -v
==4801== ERROR SUMMARY: 3 errors from 3 contexts (suppressed: 2 from 2)
This does not occur with the mysql client library. The resultset actually has 0 rows as a result, I've tried reproducing this with a minimal test case but it appears it is relevant to have a lot of data in the table in question so I haven't been able to reproduce it.
HOWEVER, I have found the issue and resolved it, it appears to be some pointer arithmatic issues. I'll attach the correction.
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Bug
Major