Join GitHub today
GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together.
Sign upFix panic safety issue in drop #15
Merged
Conversation
|
This may not be the solution you want. But it should help anyway, to illustrate the problem(?). Welcome to use the test if not the fix. |
The summary is: SmallVec::drop first attempts to drop every element, then it inhibits the drop of the inner array. The panic safety issue is that a panic during drop of an element means the inhibition is never reached, so the inner data can be dropped again. If Drop is split betweeen SmallVec and SmallVecData, this issue is avoided because the SmallVecData drop will be called even in the panic case. This solution incurs the overhead of an additional drop flag on SmallVecData. Fixes #14
bluss
changed the title
|
Updated fix to not use NoDrop -- the inner SmallVecData serves the same purpose. |
|
Yes, I prefer this second version. Thanks! |
|
@bors-servo r+ |
|
|
bors-servo
pushed a commit
that referenced
this pull request
Aug 21, 2015
Fix panic safety issue in drop The summary is: SmallVec::drop first attempts to drop every element, then it inhibits the drop of the inner array. The panic safety issue is that a panic during drop of an element means the inhibition is never reached, so the inner data can be dropped again. If Drop is split betweeen SmallVec and SmallVecData, this issue is avoided because the SmallVecData drop will be called even in the panic case. This solution incurs the overhead of an additional drop flag on SmallVecData. Fixes #14
|
|
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
bluss commentedAug 20, 2015
The summary is: SmallVec::drop first attempts to drop every element,
then it inhibits the drop of the inner array. The panic safety issue is
that a panic during drop of an element means the inhibition is never
reached, so the inner data can be dropped again.
If Drop is split betweeen SmallVec and SmallVecData, this issue is
avoided because the SmallVecData drop will be called even in the panic
case.
This solution incurs the overhead of an additional drop flag on
SmallVecData.
Fixes #14