Skip to content

[3.9] bpo-41735: Fix thread locks in zlib module may go wrong in rare case #22130

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 1 commit into from Apr 26, 2021
Merged

[3.9] bpo-41735: Fix thread locks in zlib module may go wrong in rare case #22130

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Library/2020-09-07-21-40-07.bpo-41735.NKqGKy.rst
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Fix thread locks in zlib module may go wrong in rare case. Patch by Ma Lin.
8 changes: 4 additions & 4 deletions Modules/zlibmodule.c
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -667,11 +667,11 @@ zlib_Compress_compress_impl(compobject *self, Py_buffer *data)
Py_ssize_t ibuflen, obuflen = DEF_BUF_SIZE;
int err;

ENTER_ZLIB(self);

self->zst.next_in = data->buf;
ibuflen = data->len;

ENTER_ZLIB(self);

do {
arrange_input_buffer(&self->zst, &ibuflen);

Expand Down Expand Up @@ -785,15 +785,15 @@ zlib_Decompress_decompress_impl(compobject *self, Py_buffer *data,
else
hard_limit = max_length;

ENTER_ZLIB(self);

self->zst.next_in = data->buf;
ibuflen = data->len;

/* limit amount of data allocated to max_length */
if (max_length && obuflen > max_length)
obuflen = max_length;

ENTER_ZLIB(self);

do {
arrange_input_buffer(&self->zst, &ibuflen);

Expand Down