[Python-checkins] Fix thread locks in zlib module may go wrong in rare case (#22132)
ambv
webhook-mailer at python.org
Mon Apr 26 15:48:24 EDT 2021
https://github.com/python/cpython/commit/196b8f300479d4e4050d9af9ba4ed82ee1e81dc8
commit: 196b8f300479d4e4050d9af9ba4ed82ee1e81dc8
branch: 3.8
author: Ma Lin <animalize at users.noreply.github.com>
committer: ambv <lukasz at langa.pl>
date: 2021-04-26T21:48:20+02:00
summary:
Fix thread locks in zlib module may go wrong in rare case (#22132)
Setting `next_in` before acquiring the thread lock may mix up compress/decompress state in other threads.
files:
A Misc/NEWS.d/next/Library/2020-09-07-21-51-17.bpo-41735.NKqGKy.rst
M Modules/zlibmodule.c
diff --git a/Misc/NEWS.d/next/Library/2020-09-07-21-51-17.bpo-41735.NKqGKy.rst b/Misc/NEWS.d/next/Library/2020-09-07-21-51-17.bpo-41735.NKqGKy.rst
new file mode 100644
index 0000000000000..9e36435a364ea
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2020-09-07-21-51-17.bpo-41735.NKqGKy.rst
@@ -0,0 +1 @@
+Fix thread locks in zlib module may go wrong in rare case. Patch by Ma Lin.
diff --git a/Modules/zlibmodule.c b/Modules/zlibmodule.c
index a3d9ed6646dec..d6b6b01d89a17 100644
--- a/Modules/zlibmodule.c
+++ b/Modules/zlibmodule.c
@@ -653,11 +653,11 @@ 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);
@@ -771,6 +771,8 @@ 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;
@@ -778,8 +780,6 @@ zlib_Decompress_decompress_impl(compobject *self, Py_buffer *data,
if (max_length && obuflen > max_length)
obuflen = max_length;
- ENTER_ZLIB(self);
-
do {
arrange_input_buffer(&self->zst, &ibuflen);
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