63e2bed0ab
The code parsing register lists involves an inner loop on each range defined by the lo,hi bounds. The condition on this loop (for lo<=hi) is fragile, because the bounds are unsigned 16 bits numbers. In some corner cases, the calculated upper bound is 2^16-1 leading to an infinite loop. Parsing operand `[):[o-FP` results in: - an infinite loop for non ARM architectures - the generation of almost 2^16 errors for the ARM architecture (which are then ignored) This CL improves the code in 3 ways: - bail out early when parsing non R prefixed registers - make sure the register index is never negative - make sure the number of iterations is limited by the maximum size of the range (as a defensive measure). Fixes #12469 Change-Id: Ib1e7e36fb8ad5a3a52c50fc6219d3cfe2b39cc34 Reviewed-on: https://go-review.googlesource.com/14314 Reviewed-by: Rob Pike <r@golang.org> |
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