Fix use of invalid file descriptor

tokenize_buffer() calls setup_stream() with a file descriptor argument of -1.
This number makes it all the way into nextchar_slow(), where -1 is used as an
actual file descriptor when calling read().

Check for the -1 before calling read() if the buffer is empty.

(By the way, that read() there is probably missing some additional error
 handling. An EINTR at the right moment...)

Signed-off-by: Vegard Nossum <vegardno@ifi.uio.no>

1 files changed, 2 insertions, 0 deletions

diff --git a/tokenize.c b/tokenize.c
index e72c56ed..d154882d 100644
--- a/tokenize.c
+++ b/tokenize.c
@@ -213,6 +213,8 @@ restart:
 
 repeat:
 	if (offset >= size) {
+		if (stream->fd < 0)
+			goto got_eof;
 		size = read(stream->fd, stream->buffer, BUFSIZE);
 		if (size <= 0)
 			goto got_eof;