af06e65910
The IndexString implementation in the bytealg package requires that the string passed into it be in the range '2 <= len(s) <= MaxLen' where MaxLen may be any value (including 0). CL 156998 added calls to bytealg.IndexString where MaxLen was not first checked. This led to an illegal instruction on s390x with the vector facility disabled. This CL guards the calls to bytealg.IndexString with a MaxLen check. If the check fails then the code now falls back to the pre CL 156998 implementation (a loop over the runes in the string). Since the MaxLen check is now in place the generic implementation is no longer called so I have returned it to its original unimplemented state. In future we may want to drop MaxLen to prevent this kind of confusion. Fixes #41595. Change-Id: I81d88cf8c5ae143a8f5f460d18f8269cb6c0f28c Reviewed-on: https://go-review.googlesource.com/c/go/+/256921 Trust: Michael Munday <mike.munday@ibm.com> Run-TryBot: Michael Munday <mike.munday@ibm.com> Reviewed-by: Keith Randall <khr@golang.org> TryBot-Result: Go Bot <gobot@golang.org> |
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