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debug/dwarf: don't crash on negative range/rnglist offset

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No test case because the problem can only happen for invalid data. Let
the fuzzer find cases like this.

Fixes #55948

Change-Id: I7ba40ba928d2a14d4ac5b39f966173f3868d4729
Reviewed-on: https://go-review.googlesource.com/c/go/+/436876
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Than McIntosh <thanm@google.com>
This commit is contained in:
Ian Lance Taylor 2022-09-29 15:00:08 -07:00 committed by Gopher Robot
parent cc90e45f1d
commit 20da893e83
1 changed files with 2 additions and 2 deletions
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4
src/debug/dwarf/entry.go
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@ -1104,7 +1104,7 @@ func (d *Data) baseAddressForEntry(e *Entry) (*Entry, uint64, error) {
}
func (d *Data) dwarf2Ranges(u *unit, base uint64, ranges int64, ret [][2]uint64) ([][2]uint64, error) {
if ranges > int64(len(d.ranges)) {
if ranges < 0 || ranges > int64(len(d.ranges)) {
return nil, fmt.Errorf("invalid range offset %d (max %d)", ranges, len(d.ranges))
}
buf := makeBuf(d, u, "ranges", Offset(ranges), d.ranges[ranges:])
@ -1129,7 +1129,7 @@ func (d *Data) dwarf2Ranges(u *unit, base uint64, ranges int64, ret [][2]uint64)
// dwarf5Ranges interprets a debug_rnglists sequence, see DWARFv5 section
// 2.17.3 (page 53).
func (d *Data) dwarf5Ranges(u *unit, cu *Entry, base uint64, ranges int64, ret [][2]uint64) ([][2]uint64, error) {
if ranges > int64(len(d.rngLists)) {
if ranges < 0 || ranges > int64(len(d.rngLists)) {
return nil, fmt.Errorf("invalid rnglist offset %d (max %d)", ranges, len(d.ranges))
}
var addrBase int64