commit | b39e0f461c099abf98f5a8c81d58d32d9a765a03 | [log] [tgz] |
---|---|---|
author | Matthew Dempsky <mdempsky@google.com> | Tue Jul 27 18:30:38 2021 -0700 |
committer | Matthew Dempsky <mdempsky@google.com> | Wed Jul 28 03:27:13 2021 +0000 |
tree | 3700f94556618f11f37a64e5298cf554b3d90597 | |
parent | 7cd10c1149e51a9d2f0868babaf66b8091b9c0b9 [diff] |
runtime: don't crash on nil pointers in checkptrAlignment Ironically, checkptrAlignment had a latent case of bad pointer arithmetic: if ptr is nil, then `add(ptr, size-1)` might produce an illegal pointer value. The fix is to simply check for nil at the top of checkptrAlignment, and short-circuit if so. This CL also adds a more explicit bounds check in checkptrStraddles, rather than relying on `add(ptr, size-1)` to wrap around. I don't think this is necessary today, but it seems prudent to be careful. Fixes #47430. Change-Id: I5c50b2f7f41415dbebbd803e1b8e7766ca95e1fd Reviewed-on: https://go-review.googlesource.com/c/go/+/338029 Trust: Matthew Dempsky <mdempsky@google.com> Run-TryBot: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Keith Randall <khr@golang.org>
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