From f1ec8ac84a8540b92a16f187bfa92b2f3c63917e Mon Sep 17 00:00:00 2001
From: Colin Cross <ccross@android.com>
Date: Mon, 23 Jul 2012 17:09:42 -0700
Subject: [PATCH] libsparse: fix 32 bit overflow when calculating last chunk

last_block * s->block_size can overflow when writing large filesystems,
cast to 64 bits before multiplying.

Change-Id: I3e54097852ce7d0fd271eab53d65e666284898e4
---
 libsparse/sparse.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libsparse/sparse.c b/libsparse/sparse.c
index 189b4c03e..741e8c6fc 100644
--- a/libsparse/sparse.c
+++ b/libsparse/sparse.c
@@ -139,7 +139,7 @@ static int write_all_blocks(struct sparse_file *s, struct output_file *out)
 				DIV_ROUND_UP(backed_block_len(bb), s->block_size);
 	}
 
-	pad = s->len - last_block * s->block_size;
+	pad = s->len - (int64_t)last_block * s->block_size;
 	assert(pad >= 0);
 	if (pad > 0) {
 		write_skip_chunk(out, pad);