The 'giveRightToVote' function lacks access control, allowing any user to call it. This can lead to unauthorized manipulation of voter rights.
Recommended Fix
Add a modifier to restrict this function's access to only the chairperson.
#2 Potential Delegation Loop
Severity: MajorIssue Type: Security
Range
Lines 54 - 74
Description
In the 'delegate' function, the loop for checking delegation cycles does not have a failsafe against potentially unbounded looping.
Recommended Fix
Implement a limit to the delegation chain length to prevent potential denial of service attacks.
#3 Overwriting Voter Weight
Severity: ModerateIssue Type: Security
Range
Lines 50 - 50
Description
Setting voter weight directly to 1 in 'giveRightToVote' can inadvertently overwrite an existing voter's weight, which may have been increased due to vote delegation.
Recommended Fix
Check if the voter already has a weight assigned and avoid overwriting it.
#4 Unchecked Proposal Index
Severity: ModerateIssue Type: Security
Range
Lines 76 - 86
Description
The 'vote' function does not validate the provided proposal index, which could lead to out-of-bounds access.
Recommended Fix
Add a check to ensure the proposal index is within the range of the proposals array.
#5 Public Mapping Exposure
Severity: ModerateIssue Type: Security
Range
Lines 25 - 25
Description
The 'voters' mapping is publicly exposed, potentially revealing sensitive voting information.
Recommended Fix
Change the visibility of 'voters' mapping to private and provide a function to access necessary information securely.
#6 Inefficient Storage for 'Proposal' struct
Severity: MinorIssue Type: Gas Optimisation
Range
Lines 18 - 21
Description
The 'Proposal' struct uses 'bytes32' for the name, which might be inefficient if proposal names are typically shorter.
Recommended Fix
Consider using a dynamic string type if proposal names vary significantly in length.
#7 Gas Inefficient Constructor
Severity: MinorIssue Type: Gas Optimisation
Range
Lines 33 - 41
Description
The constructor iterates over the input array, which can be gas-inefficient for a large number of proposals.
Recommended Fix
Optimize the loop in the constructor or set a limit to the number of proposals.
#8 Outdated Compiler Version
Severity: MinorIssue Type: Coding Style
Range
Lines 3 - 3
Description
The pragma directive allows outdated compiler versions. Using older versions can expose known vulnerabilities.
Recommended Fix
Specify a more recent compiler version, ideally the latest stable one.
#9 Inefficient Storage and Access
Severity: MinorIssue Type: Gas Optimisation
Range
Lines 100 - 103
Description
The 'winnerName' function returns a 'bytes32', which can be inefficient for names of varying lengths and inconvenient for external calls.
Recommended Fix
Consider returning a string instead of 'bytes32' for more efficient storage and easier access.