From 8bac546e1150f213d27e5f0e0ecfaf0c826be83f Mon Sep 17 00:00:00 2001
From: Guido van Rossum <guido@python.org>
Date: Tue, 11 Jun 1996 18:38:48 +0000
Subject: Avoid core dump in resizestring() on read() with 0 bytes.

---
 Modules/posixmodule.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index 338a40c..a4268dd 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -1408,7 +1408,7 @@ posix_read(self, args)
 	object *self;
 	object *args;
 {
-	int fd, size;
+	int fd, size, n;
 	object *buffer;
 	if (!getargs(args, "(ii)", &fd, &size))
 		return NULL;
@@ -1416,13 +1416,14 @@ posix_read(self, args)
 	if (buffer == NULL)
 		return NULL;
 	BGN_SAVE
-	size = read(fd, getstringvalue(buffer), size);
+	n = read(fd, getstringvalue(buffer), size);
 	END_SAVE
-	if (size < 0) {
+	if (n < 0) {
 		DECREF(buffer);
 		return posix_error();
 	}
-	resizestring(&buffer, size);
+	if (n != size)
+		resizestring(&buffer, n);
 	return buffer;
 }
 
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