fix to ProposalPOLMessage poisoning (CON-222)

[pompon0]

The bug was about panic after setting vote at out of range index. Added a test. Additionally I have also made getters return bool to indicate if get succeeded.

[github-actions]

The latest Buf updates on your PR. Results from workflow Buf / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Mar 30, 2026, 3:06 PM

[codecov]

Codecov Report

❌ Patch coverage is 59.22330% with 42 lines in your changes missing coverage. Please review.
✅ Project coverage is 58.74%. Comparing base (03ed612) to head (cc418d3).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
sei-tendermint/internal/consensus/state.go	33.33%	4 Missing and 4 partials ⚠️
sei-tendermint/types/vote_set.go	56.25%	5 Missing and 2 partials ⚠️
sei-tendermint/types/block.go	53.84%	3 Missing and 3 partials ⚠️
...tendermint/internal/consensus/types/round_state.go	33.33%	2 Missing and 2 partials ⚠️
sei-tendermint/types/validation.go	66.66%	2 Missing and 2 partials ⚠️
sei-tendermint/internal/evidence/verify.go	40.00%	1 Missing and 2 partials ⚠️
sei-tendermint/test/e2e/runner/evidence.go	0.00%	3 Missing ⚠️
sei-tendermint/types/evidence.go	57.14%	1 Missing and 2 partials ⚠️
sei-tendermint/types/part_set.go	33.33%	1 Missing and 1 partial ⚠️
sei-tendermint/node/setup.go	66.66%	0 Missing and 1 partial ⚠️
... and 1 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3129      +/-   ##
==========================================
+ Coverage   58.72%   58.74%   +0.01%     
==========================================
  Files        2094     2094              
  Lines      173166   173193      +27     
==========================================
+ Hits       101697   101734      +37     
+ Misses      62412    62392      -20     
- Partials     9057     9067      +10     

Flag	Coverage Δ
sei-chain-pr	63.68% <59.22%> (?)
sei-db	70.41% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
sei-ibc-go/testing/chain.go	94.04% <100.00%> (ø)
sei-tendermint/internal/consensus/msgs.go	81.60% <ø> (ø)
sei-tendermint/internal/consensus/peer_state.go	87.50% <100.00%> (+3.01%)	⬆️
sei-tendermint/internal/consensus/reactor.go	71.65% <100.00%> (+2.69%)	⬆️
...rmint/internal/consensus/types/peer_round_state.go	100.00% <ø> (ø)
sei-tendermint/internal/rpc/core/status.go	81.01% <100.00%> (ø)
sei-tendermint/types/proposal.go	85.71% <100.00%> (ø)
sei-tendermint/types/validator_set.go	93.10% <100.00%> (ø)
sei-tendermint/node/setup.go	67.03% <66.66%> (ø)
sei-wasmd/x/wasm/ibctesting/chain.go	68.51% <0.00%> (-0.31%)	⬇️
... and 9 more

... and 1 file with indirect coverage changes

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[seidroid]

Created backport PR for release/v6.3:

• Backport release/v6.3: fix to ProposalPOLMessage poisoning (CON-222) #3138 with remaining conflicts!

Please cherry-pick the changes locally and resolve any conflicts.

git fetch origin backport-3129-to-release/v6.3
git worktree add --checkout .worktree/backport-3129-to-release/v6.3 backport-3129-to-release/v6.3
cd .worktree/backport-3129-to-release/v6.3
git reset --hard HEAD^
git cherry-pick -x d201e89ad5f867eea4e275b6d4ec5b80e5cf6afc
git push --force-with-lease

[seidroid]

Successfully created backport PR for release/v6.4:

• Backport release/v6.4: fix to ProposalPOLMessage poisoning (CON-222) #3139