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internal/obj: protect against nil addr.Sym

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This has been the root cause of a number of crashes caused by
fuzz throwing modem noise at the assembler, which in turn attempts
to print diagnostics but instead just gets crashes.

Fixes #12627.

Change-Id: I72c2da79d8eb240e1a37aa6140454c552b05e0f1
Reviewed-on: https://go-review.googlesource.com/14595
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Rob Pike 2015-09-15 10:59:27 -07:00
parent dace9397b1
commit 448f84a43a
1 changed files with 15 additions and 3 deletions
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18
src/cmd/internal/obj/util.go
View file

@ -457,13 +457,25 @@ func Mconv(a *Addr) string {
}
case NAME_EXTERN:
str = fmt.Sprintf("%s%s(SB)", a.Sym.Name, offConv(a.Offset))
if a.Sym != nil {
str = fmt.Sprintf("%s%s(SB)", a.Sym.Name, offConv(a.Offset))
} else {
str = fmt.Sprintf("%s(SB)", offConv(a.Offset))
}
case NAME_GOTREF:
str = fmt.Sprintf("%s%s@GOT(SB)", a.Sym.Name, offConv(a.Offset))
if a.Sym != nil {
str = fmt.Sprintf("%s%s@GOT(SB)", a.Sym.Name, offConv(a.Offset))
} else {
str = fmt.Sprintf("%s@GOT(SB)", offConv(a.Offset))
}
case NAME_STATIC:
str = fmt.Sprintf("%s<>%s(SB)", a.Sym.Name, offConv(a.Offset))
if a.Sym != nil {
str = fmt.Sprintf("%s<>%s(SB)", a.Sym.Name, offConv(a.Offset))
} else {
str = fmt.Sprintf("<>%s(SB)", offConv(a.Offset))
}
case NAME_AUTO:
if a.Sym != nil {