Hello:
This patch was applied to bpf/bpf-next.git (refs/heads/master):
On Wed, 14 Oct 2020 10:56:08 -0700 you wrote:
> From: Alexei Starovoitov <ast@xxxxxxxxxx>
>
> The 64-bit JEQ/JNE handling in reg_set_min_max() was clearing reg->id in either
> true or false branch. In the case 'if (reg->id)' check was done on the other
> branch the counter part register would have reg->id == 0 when called into
> find_equal_scalars(). In such case the helper would incorrectly identify other
> registers with id == 0 as equivalent and propagate the state incorrectly.
> Fix it by preserving ID across reg_set_min_max().
> In other words any kind of comparison operator on the scalar register
> should preserve its ID to recognize:
> r1 = r2
> if (r1 == 20) {
> #1 here both r1 and r2 == 20
> } else if (r2 < 20) {
> #2 here both r1 and r2 < 20
> }
>
> [...]
Here is the summary with links:
- [bpf-next] bpf: Fix register equivalence tracking.
https://git.kernel.org/bpf/bpf-next/c/e688c3db7ca6
You are awesome, thank you!
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