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Synthetic symbol leak in elf_read_minimal_symbols

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Detected this leak with valgrind memcheck:

==30840== 194 bytes in 1 blocks are definitely lost in loss record 9,138 of 10,922
==30840==    at 0x4C2DB8F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==30840==    by 0x80DF82: bfd_malloc (libbfd.c:193)
==30840==    by 0x80E12D: bfd_zmalloc (libbfd.c:278)
==30840==    by 0x819E80: elf_x86_64_get_synthetic_symtab (elf64-x86-64.c:6835)
==30840==    by 0x4F7B01: elf_read_minimal_symbols(objfile*, int, elfinfo const*) (elfread.c:1124)
==30840==    by 0x4F7CE7: elf_symfile_read(objfile*, enum_flags<symfile_add_flag>) (elfread.c:1182)
==30840==    by 0x7557FC: read_symbols(objfile*, enum_flags<symfile_add_flag>) (symfile.c:861)
==30840==    by 0x755EE1: syms_from_objfile_1(objfile*, section_addr_info*, enum_flags<symfile_add_flag>) (symfile.c:1062)

We perform a dynamic allocation in
elf64-x86-64.c:elf_x86_64_get_synthetic_symtab

  s = *ret = (asymbol *) bfd_zmalloc (size);

that appear to never get freed.

gdb:

2017-08-17  Alex Lindsay  <alexlindsay239@gmail.com>

	* elfread.c (elf_read_minimal_symbols): xfree synthsyms.
This commit is contained in:
Alex Lindsay
2017-08-17 11:53:53 +01:00
committed by Yao Qi
parent 44d0fb3a0a
commit ba7139188c
2 changed files with 7 additions and 0 deletions
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4
gdb/ChangeLog
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@ -1,3 +1,7 @@
2017-08-17 Alex Lindsay <alexlindsay239@gmail.com> (tiny change)
* elfread.c (elf_read_minimal_symbols): xfree synthsyms.
2017-08-17 Ruslan Kabatsayev <b7.10110111@gmail.com>
* NEWS: Mention new shortcuts for nexti and stepi in TUI

3
gdb/elfread.c
View File

@ -1132,6 +1132,9 @@ elf_read_minimal_symbols (struct objfile *objfile, int symfile_flags,
synth_symbol_table[i] = synthsyms + i;
elf_symtab_read (reader, objfile, ST_SYNTHETIC, synthcount,
synth_symbol_table.get (), true);
xfree (synthsyms);
synthsyms = NULL;
}
/* Install any minimal symbols that have been collected as the current