Messages in this thread Patch in this message | | | From | He Kuang <> | Subject | [PATCH 4/4] perf probe: Add failure check when show variable range | Date | Wed, 1 Jul 2015 09:05:39 +0000 |
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Change improper type size_t to diffptr_t to make consistent with libdw and handle error code.
Signed-off-by: He Kuang <hekuang@huawei.com> --- tools/perf/util/dwarf-aux.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/tools/perf/util/dwarf-aux.c b/tools/perf/util/dwarf-aux.c index 2cb4c82..da96eb1 100644 --- a/tools/perf/util/dwarf-aux.c +++ b/tools/perf/util/dwarf-aux.c @@ -965,7 +965,7 @@ static int die_get_var_innermost_scope(Dwarf_Die *sp_die, Dwarf_Die *vr_die, { Dwarf_Die *scopes; int count; - size_t offset = 0; + ptrdiff_t offset = 0; Dwarf_Addr base; Dwarf_Addr start, end; Dwarf_Addr entry; @@ -991,6 +991,9 @@ static int die_get_var_innermost_scope(Dwarf_Die *sp_die, Dwarf_Die *vr_die, while ((offset = dwarf_ranges(&scopes[1], offset, &base, &start, &end)) > 0) { + if (offset < 0) + goto out; + start -= entry; end -= entry; @@ -1029,7 +1032,7 @@ int die_get_var_range(Dwarf_Die *sp_die, Dwarf_Die *vr_die, struct strbuf *buf) Dwarf_Addr entry; Dwarf_Op *op; size_t nops; - size_t offset = 0; + ptrdiff_t offset = 0; Dwarf_Attribute attr; bool first = true; const char *name; @@ -1048,6 +1051,9 @@ int die_get_var_range(Dwarf_Die *sp_die, Dwarf_Die *vr_die, struct strbuf *buf) while ((offset = dwarf_getlocations( &attr, offset, &base, &start, &end, &op, &nops)) > 0) { + if (offset < 0) + return offset; + if (start == 0) { /* Single Location Descriptions */ ret = die_get_var_innermost_scope(sp_die, vr_die, buf); -- 1.8.5.2
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