From 22531545514043e04633e1c015c7540b9de9dbe4 Mon Sep 17 00:00:00 2001
From: Tim Kientzle <kientzle@acm.org>
Date: Fri, 22 Mar 2013 23:48:41 -0700
Subject: [PATCH] Limit write requests to at most INT_MAX. This prevents a
 certain common programming error (passing -1 to write) from leading to other
 problems deeper in the library.

---
 libarchive/archive_write.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libarchive/archive_write.c b/libarchive/archive_write.c
index eede5e0..be85621 100644
--- a/libarchive/archive_write.c
+++ b/libarchive/archive_write.c
@@ -673,8 +673,13 @@ static ssize_t
 _archive_write_data(struct archive *_a, const void *buff, size_t s)
 {
 	struct archive_write *a = (struct archive_write *)_a;
+	const size_t max_write = INT_MAX;
+
 	archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC,
 	    ARCHIVE_STATE_DATA, "archive_write_data");
+	/* In particular, this catches attempts to pass negative values. */
+	if (s > max_write)
+		s = max_write;
 	archive_clear_error(&a->archive);
 	return ((a->format_write_data)(a, buff, s));
 }
-- 
1.8.1