pythoncapi
diff --git a/‎Misc/NEWS.d/next/Core and Builtins/2018-05-31-14-50-04.bpo-33706.ztlH04.rst‎
Lines changed: 2 additions & 0 deletions b/‎Misc/NEWS.d/next/Core and Builtins/2018-05-31-14-50-04.bpo-33706.ztlH04.rst‎
Lines changed: 2 additions & 0 deletions
diff --git a/‎Modules/main.c‎
Lines changed: 1 addition & 1 deletion b/‎Modules/main.c‎
Lines changed: 1 addition & 1 deletion
@@ -0,0 +1,2 @@
+Fix a crash in Python initialization when parsing the command line options.
+Thanks Christoph Gohlke for the bug report and the fix!
@@ -761,7 +761,7 @@ pymain_parse_cmdline_impl(_PyMain *pymain, _Py_CommandLineDetails *cmdline)
                 pymain->err = _Py_INIT_NO_MEMORY();
                 return -1;
             }
-            memcpy(command, _PyOS_optarg, len * sizeof(wchar_t));
+            memcpy(command, _PyOS_optarg, (len - 2) * sizeof(wchar_t));
             command[len - 2] = '\n';
             command[len - 1] = 0;
             pymain->command = command;
Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,2 @@`
	`1`	`+Fix a crash in Python initialization when parsing the command line options.`
	`2`	`+Thanks Christoph Gohlke for the bug report and the fix!`
Original file line number	Diff line number	Diff line change
`@@ -761,7 +761,7 @@ pymain_parse_cmdline_impl(_PyMain pymain, _Py_CommandLineDetails cmdline)`
`761`	`761`	`pymain->err = _Py_INIT_NO_MEMORY();`
`762`	`762`	`return -1;`
`763`	`763`	`}`
`764`		`- memcpy(command, _PyOS_optarg, len * sizeof(wchar_t));`
	`764`	`+ memcpy(command, _PyOS_optarg, (len - 2) * sizeof(wchar_t));`
`765`	`765`	`command[len - 2] = '\n';`
`766`	`766`	`command[len - 1] = 0;`
`767`	`767`	`pymain->command = command;`