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program: Add comment for program discriminator #77

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Merged
febo merged 1 commit into from
Jun 3, 2026
+4 −2
Merged

program: Add comment for program discriminator #77

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6 changes: 4 additions & 2 deletions program/src/processor/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -64,8 +64,10 @@ fn is_program_authority(
let expected_program_data = {
let data = unsafe { program.borrow_unchecked() };
match (data.first(), program.executable()) {
(Some(2 /* program discriminator */), true) => {
let offset: usize = 4 /* discriminator */;
// The discriminator is 4 bytes, but we only need to check the first byte
// since there are fewer than 256 account types.
(Some(2), true) => {
let offset: usize = 4;
Address::try_from(&data[offset..offset + ADDRESS_BYTES])
.map_err(|_| ProgramError::InvalidAccountData)?
}
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