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

parent ec7d9dc7

libsparse/sparse.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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);