Change to address CVE-2016-7207 #1979
Merged
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
…ow function parameter lists. Since we can't identify such syntax on the initial scan and have to backtrack and re-parse, our stacks of identifier references enter an inconsistent state that causes us to bind non-existent references and treat them as closure-captured. This in turn leads to bad byte code generation. The problem is easy to solve in the case of a single arrow function parameter not enclosed in parentheses. To handle the harder case of a list enclosed in parens, advance the current block ID when we begin parsing a parenthetical expression. Identifier references will be created that are amenable to the arrow function case, and if we do wind up with an arrow function, we only need to correct the function ID's on the references we've already made.
pleath
force-pushed
the
release/1611.1.3
branch
from
5295b7f
to
1ea9ef6
Compare
|
@aneeshdk This is related to the arrow function parameter fix you reviewed previously. |
|
|
|
LGTM |
chakrabot
pushed a commit
that referenced
this pull request
Nov 10, 2016
Merge pull request #1979 from pleath:release/1611.1.3 Fix incorrect identification of non-local-references when parsing arrow function parameter lists. Since we can't identify such syntax on the initial scan and have to backtrack and re-parse, our stacks of identifier references enter an inconsistent state that causes us to bind non-existent references and treat them as closure-captured. This in turn leads to bad byte code generation. The problem is easy to solve in the case of a single arrow function parameter not enclosed in parentheses. To handle the harder case of a list enclosed in parens, advance the current block ID when we begin parsing a parenthetical expression. Identifier references will be created that are amenable to the arrow function case, and if we do wind up with an arrow function, we only need to correct the function ID's on the references we've already made.
chakrabot
pushed a commit
that referenced
this pull request
Nov 10, 2016
Merge pull request #1979 from pleath:release/1611.1.3 Fix incorrect identification of non-local-references when parsing arrow function parameter lists. Since we can't identify such syntax on the initial scan and have to backtrack and re-parse, our stacks of identifier references enter an inconsistent state that causes us to bind non-existent references and treat them as closure-captured. This in turn leads to bad byte code generation. The problem is easy to solve in the case of a single arrow function parameter not enclosed in parentheses. To handle the harder case of a list enclosed in parens, advance the current block ID when we begin parsing a parenthetical expression. Identifier references will be created that are amenable to the arrow function case, and if we do wind up with an arrow function, we only need to correct the function ID's on the references we've already made.
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.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Fix incorrect identification of non-local-references when parsing arrow function parameter lists. Since we can't identify such syntax on the initial scan and have to backtrack and re-parse, our stacks of identifier references enter an inconsistent state that causes us to bind non-existent references and treat them as closure-captured. This in turn leads to bad byte code generation. The problem is easy to solve in the case of a single arrow function parameter not enclosed in parentheses. To handle the harder case of a list enclosed in parens, advance the current block ID when we begin parsing a parenthetical expression. Identifier references will be created that are amenable to the arrow function case, and if we do wind up with an arrow function, we only need to correct the function ID's on the references we've already made.