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@0x/contracts-zero-ex: Use consistent returndatasize checks in UniswapFeature (#96)

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Co-authored-by: Lawrence Forman <me@merklejerk.com>
This commit is contained in:
Lawrence Forman
2021-01-05 14:40:08 -05:00
committed by GitHub
parent f9078bb1c3
commit 2394eb62aa
2 changed files with 13 additions and 4 deletions
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8
contracts/zero-ex/contracts/src/features/UniswapFeature.sol
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@@ -209,8 +209,8 @@ contract UniswapFeature is
if iszero(staticcall(gas(), pair, 0xB00, 0x4, 0xC00, 0x40)) {
bubbleRevert()
}
// Revert if the pair contract does not return two words.
if iszero(eq(returndatasize(), 0x40)) {
// Revert if the pair contract does not return at least two words.
if lt(returndatasize(), 0x40) {
revert(0,0)
}
@@ -389,8 +389,8 @@ contract UniswapFeature is
// Call to allowance() failed.
bubbleRevert()
}
// Make sure the allowance call returned a single word.
if iszero(eq(returndatasize(), 0x20)) {
// Make sure the allowance call returned at least a word.
if lt(returndatasize(), 0x20) {
revert(0, 0)
}
// Call succeeded.