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pkg/dwarf/frame: fix parsing of zero length entries

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Some linkers will sometimes insert a zero length entry between the last
FDE of a CIE and the next CIE.
This commit is contained in:
aarzilli 2017-09-12 12:40:19 +02:00 committed by Derek Parker
parent ce83862d80
commit a5b230b81d
1 changed files with 10 additions and 3 deletions
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13
pkg/dwarf/frame/parser.go
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@ -45,11 +45,18 @@ func cieEntry(data []byte) bool {
}
func parselength(ctx *parseContext) parsefunc {
var data = ctx.buf.Next(8)
binary.Read(ctx.buf, binary.LittleEndian, &ctx.length)
ctx.length = binary.LittleEndian.Uint32(data[:4]) - 4 // take off the length of the CIE id / CIE pointer.
if ctx.length == 0 {
// ZERO terminator
return parselength
}
if cieEntry(data[4:]) {
var data = ctx.buf.Next(4)
ctx.length -= 4 // take off the length of the CIE id / CIE pointer.
if cieEntry(data) {
ctx.common = &CommonInformationEntry{Length: ctx.length}
return parseCIE
}