diff options
Diffstat (limited to 'src/runtime/panic.go')
| -rw-r--r-- | src/runtime/panic.go | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/src/runtime/panic.go b/src/runtime/panic.go index 48b1b5dd9d..e4bdceb32f 100644 --- a/src/runtime/panic.go +++ b/src/runtime/panic.go @@ -338,7 +338,17 @@ func newdefer() *_defer { // Free the given defer. // The defer cannot be used after this call. +// +// This is nosplit because the incoming defer is in a perilous state. +// It's not on any defer list, so stack copying won't adjust stack +// pointers in it (namely, d.link). Hence, if we were to copy the +// stack, d could then contain a stale pointer. +// +//go:nosplit func freedefer(d *_defer) { + d.link = nil + // After this point we can copy the stack. + if d._panic != nil { freedeferpanic() } |