Repository navigation
gh-131181: Fix possible NULL pointer dereference in Modules/_ctypes/_ctypes.c - #131186
Closed
dyupina wants to merge 1 commit into
Closed
dyupina wants to merge 1 commit into
dyupina wants to merge 1 commit into
Conversation
Copy link
Copy Markdown
Sorry, something went wrong.
Copy link
Copy Markdown
|
The following commit authors need to sign the Contributor License Agreement: Click the button to sign: |
Sorry, something went wrong.
Copy link
Copy Markdown
|
Most changes to Python require a NEWS entry. Add one using the blurb_it web app or the blurb command-line tool. If this change has little impact on Python users, wait for a maintainer to apply the skip news label instead. |
Sorry, something went wrong.
This file contains hidden or 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
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Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be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.
In the PyCData_NewGetBuffer() (file Modules/_ctypes/_ctypes.c), the PyObject_stgdict() is called, which may return NULL.
Its result is assigned to dict, then dict is dereferenced (view->format = dict->format ? dict->format : "B";).
If dict is NULL, a null pointer dereference will occur, so a check for NULL need to be added.
Similarly, in the PyCData_reduce() (file Modules/_ctypes/_ctypes.c) PyObject_stgdict(myself) may return NULL, so need to check result to prevent null pointer dereferencing.
Commit dcaf33a (Author: @encukou) fixes this problems, but it is very large and probably difficult to backport, so I suggest adding assert(); before the dereference.
This needs to be added to branches 3.1 - 3.12.
Found by Linux Verification Center (linuxtesting.org) with SVACE.