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perf symbols: Fix ppc64 SEGV in dso__load_sym with debuginfo files 

64bit PowerPC debuginfo files have an empty function descriptor section.
I hit a SEGV when perf tried to use this section for symbol resolution.

To fix this we need to check the section is valid and we can do this by
checking for type SHT_PROGBITS.

Cc: <stable@kernel.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Eric B Munson <emunson@mgebm.net>
Link: http://lkml.kernel.org/r/20110824065242.895239970@samba.org
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Anton Blanchard 2011-08-24 16:40:14 +10:00 committed by Arnaldo Carvalho de Melo
parent f66fedcb72
commit adb0918463
1 changed files with 2 additions and 0 deletions
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2
tools/perf/util/symbol.c
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@ -1111,6 +1111,8 @@ static int dso__load_sym(struct dso *dso, struct map *map, const char *name,
} }
opdsec = elf_section_by_name(elf, &ehdr, &opdshdr, ".opd", &opdidx); opdsec = elf_section_by_name(elf, &ehdr, &opdshdr, ".opd", &opdidx);
if (opdshdr.sh_type != SHT_PROGBITS)
opdsec = NULL;
if (opdsec) if (opdsec)
opddata = elf_rawdata(opdsec, NULL); opddata = elf_rawdata(opdsec, NULL);