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runtime: stack copier should handle nil defers without faulting.

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fixes #8047

LGTM=rsc
R=golang-codereviews, rsc
CC=golang-codereviews
https://golang.org/cl/101800043
This commit is contained in:
Keith Randall 2014-05-27 16:26:08 -07:00
parent bd401baef2
commit 3d1c3e1e26
1 changed files with 10 additions and 2 deletions
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12
src/pkg/runtime/stack.c
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@ -344,6 +344,8 @@ copyabletopsegment(G *gp)
if(d->argp < cinfo.stk || cinfo.base <= d->argp)
break; // a defer for the next segment
fn = d->fn;
if(fn == nil) // See issue 8047
continue;
f = runtime·findfunc((uintptr)fn->fn);
if(f == nil)
return -1;
@ -552,13 +554,19 @@ adjustdefers(G *gp, AdjustInfo *adjinfo)
}
if(d->argp < adjinfo->oldstk || adjinfo->oldbase <= d->argp)
break; // a defer for the next segment
f = runtime·findfunc((uintptr)d->fn->fn);
fn = d->fn;
if(fn == nil) {
// Defer of nil function. It will panic when run, and there
// aren't any args to adjust. See issue 8047.
d->argp += adjinfo->delta;
continue;
}
f = runtime·findfunc((uintptr)fn->fn);
if(f == nil)
runtime·throw("can't adjust unknown defer");
if(StackDebug >= 4)
runtime·printf(" checking defer %s\n", runtime·funcname(f));
// Defer's FuncVal might be on the stack
fn = d->fn;
if(adjinfo->oldstk <= (byte*)fn && (byte*)fn < adjinfo->oldbase) {
if(StackDebug >= 3)
runtime·printf(" adjust defer fn %s\n", runtime·funcname(f));