OS/2 specific fixes related to SF bug # 1003471

1 files changed, 11 insertions, 0 deletions

diff --git a/PC/os2vacpp/getpathp.c b/PC/os2vacpp/getpathp.c
index 5860e752c3..607f2a192a 100644
--- a/PC/os2vacpp/getpathp.c
+++ b/PC/os2vacpp/getpathp.c
@@ -83,6 +83,15 @@ exists(char *filename)
 }
 
 
+/* Add a path component, by appending stuff to buffer.
+   buffer must have at least MAXPATHLEN + 1 bytes allocated, and contain a
+   NUL-terminated string with no more than MAXPATHLEN characters (not counting
+   the trailing NUL).  It's a fatal error if it contains a string longer than
+   that (callers must be careful!).  If these requirements are met, it's
+   guaranteed that buffer will still be a NUL-terminated string with no more
+   than MAXPATHLEN characters at exit.  If stuff is too long, only as much of
+   stuff as fits will be appended.
+*/
 static void
 join(char *buffer, char *stuff)
 {
@@ -94,6 +103,8 @@ join(char *buffer, char *stuff)
 		if (n > 0 && !is_sep(buffer[n-1]) && n < MAXPATHLEN)
 			buffer[n++] = SEP;
 	}
+	if (n > MAXPATHLEN)
+		Py_FatalError("buffer overflow in getpathp.c's joinpath()");
 	k = strlen(stuff);
 	if (n + k > MAXPATHLEN)
 		k = MAXPATHLEN - n;